{"id":113621,"date":"2026-10-07T00:33:21","date_gmt":"2026-10-06T16:33:21","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/113621.html"},"modified":"2026-10-07T00:33:21","modified_gmt":"2026-10-06T16:33:21","slug":"beast-%e5%8d%8f%e7%a8%8b%e5%bc%82%e6%ad%a5-http-%e6%9c%8d%e5%8a%a1%e5%99%a8","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/113621.html","title":{"rendered":"Beast \u534f\u7a0b\u5f02\u6b65 HTTP \u670d\u52a1\u5668"},"content":{"rendered":"<\/p>\n<h4>\u6587\u7ae0\u76ee\u5f55<\/h4>\n<ul>\n<li>\n<ul>\n<li>\u6574\u4f53\u67b6\u6784<\/li>\n<li>\u6838\u5fc3\u4f9d\u8d56\u4e0e\u7f16\u8bd1\u914d\u7f6e<\/li>\n<li>\n<ul>\n<li>CMakeLists.txt \u5173\u952e\u914d\u7f6e<\/li>\n<li>\u5934\u6587\u4ef6\u6e05\u5355\u4e0e\u4f5c\u7528<\/li>\n<\/ul>\n<\/li>\n<li>Beast HTTP \u6838\u5fc3 API \u6df1\u5165<\/li>\n<li>\n<ul>\n<li>\u547d\u540d\u7a7a\u95f4\u7ea6\u5b9a<\/li>\n<li>&#096;http::request&lt;Body&gt;&#096; \u2014 HTTP \u8bf7\u6c42<\/li>\n<li>\n<ul>\n<li>request \u6838\u5fc3\u65b9\u6cd5\u4e00\u89c8<\/li>\n<li>&#096;http::verb&#096; \u679a\u4e3e&#xff08;\u5e38\u7528\u503c&#xff09;<\/li>\n<li>&#096;http::field&#096; \u679a\u4e3e&#xff08;\u6807\u51c6 HTTP \u5934\u90e8\u540d&#xff09;<\/li>\n<li>&#096;http::status&#096; \u679a\u4e3e&#xff08;HTTP \u72b6\u6001\u7801&#xff09;<\/li>\n<\/ul>\n<\/li>\n<li>&#096;http::response&lt;Body&gt;&#096; \u2014 HTTP \u54cd\u5e94<\/li>\n<li>\n<ul>\n<li>response \u6838\u5fc3\u65b9\u6cd5<\/li>\n<li>\u8bbe\u7f6e Content-Length \u7684\u4e24\u79cd\u65b9\u5f0f<\/li>\n<\/ul>\n<\/li>\n<li>&#096;http::dynamic_body&#096; \u2014 \u52a8\u6001\u6d88\u606f\u4f53<\/li>\n<li>&#096;beast::flat_buffer&#096; \u2014 \u8bfb\u5199\u7f13\u51b2\u533a<\/li>\n<li>&#096;beast::ostream&#096; \u2014 \u6d41\u5f0f\u5199\u5165 Body<\/li>\n<li>&#096;beast::buffers_to_string&#096; \u2014 \u7f13\u51b2\u533a\u2192\u5b57\u7b26\u4e32<\/li>\n<li>&#096;beast::error_code&#096; \u2014 \u9519\u8bef\u7801<\/li>\n<li>&#096;http::async_read&#096; \u2014 \u5f02\u6b65\u8bfb\u53d6\u5b8c\u6574 HTTP \u8bf7\u6c42<\/li>\n<li>&#096;http::async_write&#096; \u2014 \u5f02\u6b65\u53d1\u9001 HTTP \u54cd\u5e94<\/li>\n<li>&#096;http::request&#096; \/ &#096;http::response&#096; \u7684\u7ee7\u627f\u5173\u7cfb<\/li>\n<\/ul>\n<\/li>\n<li>HTTP \u8bf7\u6c42\u89e3\u6790\u5168\u6d41\u7a0b<\/li>\n<li>\n<ul>\n<li>\u6b65\u9aa4 1&#xff1a;\u539f\u59cb\u5b57\u8282\u5230\u8fbe<\/li>\n<li>\u6b65\u9aa4 2&#xff1a;&#096;http::async_read&#096; \u8bfb\u53d6\u5230 &#096;flat_buffer&#096;<\/li>\n<li>\u6b65\u9aa4 3&#xff1a;Beast \u5185\u90e8\u89e3\u6790\u5668\u5de5\u4f5c<\/li>\n<li>\u6b65\u9aa4 4&#xff1a;\u89e3\u6790\u5b8c\u6210&#xff0c;&#096;request&#096; \u5bf9\u8c61\u53ef\u67e5\u8be2<\/li>\n<li>Body \u8bfb\u53d6\u7684\u4e24\u79cd\u60c5\u51b5<\/li>\n<\/ul>\n<\/li>\n<li>HTTP \u54cd\u5e94\u6784\u9020\u4e0e\u53d1\u9001<\/li>\n<li>\n<ul>\n<li>\u54cd\u5e94\u6784\u9020\u987a\u5e8f&#xff08;\u91cd\u8981&#xff01;&#xff09;<\/li>\n<li>&#096;content_length()&#096; \u7684\u5de5\u4f5c\u539f\u7406<\/li>\n<li>\u4e0d\u540c Content-Type \u7684\u54cd\u5e94\u6784\u9020<\/li>\n<\/ul>\n<\/li>\n<li>\u8def\u7531&#xff1a;\u8bf7\u6c42\u5206\u53d1\u903b\u8f91<\/li>\n<li>\n<ul>\n<li>\u5206\u53d1\u5b9e\u73b0\u6a21\u5f0f<\/li>\n<li>POST JSON \u89e3\u6790\u6d41\u7a0b<\/li>\n<\/ul>\n<\/li>\n<li>\u534f\u7a0b\u67b6\u6784\u901f\u89c8<\/li>\n<li>\n<ul>\n<li>\u6838\u5fc3\u7c7b\u578b<\/li>\n<li>\u58f0\u660e\u534f\u7a0b<\/li>\n<li>\u542f\u52a8\u534f\u7a0b\u7684\u4e09\u79cd\u6a21\u5f0f<\/li>\n<li>\u83b7\u53d6\u5f53\u524d executor<\/li>\n<li>\u9519\u8bef\u5904\u7406<\/li>\n<li>\u8d85\u65f6\u5b88\u62a4\u534f\u7a0b&#xff08;watchdog&#xff09;\u6a21\u5f0f<\/li>\n<\/ul>\n<\/li>\n<li>Asio \u57fa\u7840\u901f\u89c8<\/li>\n<li>\n<ul>\n<li>&#096;io_context&#096; \u2014 \u4e8b\u4ef6\u5faa\u73af<\/li>\n<li>&#096;tcp::acceptor&#096; \u2014 \u76d1\u542c\u7aef\u53e3<\/li>\n<li>&#096;tcp::socket&#096; \u2014 TCP \u8fde\u63a5<\/li>\n<li>&#096;steady_timer&#096; \u2014 \u5b9a\u65f6\u5668<\/li>\n<li>&#096;signal_set&#096; \u2014 \u4fe1\u53f7\u5904\u7406<\/li>\n<\/ul>\n<\/li>\n<li>\u884c\u7ea7\u6ce8\u91ca&#xff1a;\u5b8c\u6574\u6267\u884c\u6d41\u7a0b<\/li>\n<li>\n<ul>\n<li>\u5165\u53e3&#xff1a;&#096;main()&#096;<\/li>\n<li>&#096;listener()&#096; \u2014 \u63a5\u53d7\u8fde\u63a5\u5faa\u73af<\/li>\n<li>&#096;echo(socket)&#096; \u2014 \u5904\u7406\u5355\u4e2a\u8fde\u63a5<\/li>\n<\/ul>\n<\/li>\n<li>\u81ea\u884c\u5b9e\u73b0\u6e05\u5355<\/li>\n<li>\n<ul>\n<li>Phase 1&#xff1a;\u9aa8\u67b6<\/li>\n<li>Phase 2&#xff1a;\u534f\u7a0b\u5316<\/li>\n<li>Phase 3&#xff1a;\u8bfb\u53d6 HTTP \u8bf7\u6c42<\/li>\n<li>Phase 4&#xff1a;\u6784\u9020\u5e76\u53d1\u9001\u54cd\u5e94<\/li>\n<li>Phase 5&#xff1a;\u8def\u7531<\/li>\n<li>Phase 6&#xff1a;\u5b8c\u5584<\/li>\n<\/ul>\n<\/li>\n<li>\u5feb\u901f\u53c2\u8003\u5361<\/li>\n<li>\u4e0e\u56de\u8c03\u7248\u7684\u5173\u952e\u5dee\u5f02\u5bf9\u7167<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>Beast \u534f\u7a0b\u5f02\u6b65 HTTP \u670d\u52a1\u5668&#xff08;\u539f\u6587&#xff09;<\/p>\n<p>\u57fa\u4e8e http-server-sync-coro.cpp&#xff0c;\u805a\u7126\u67b6\u6784\u8bbe\u8ba1\u3001HTTP \u534f\u8bae\u89e3\u6790\u6d41\u7a0b\u3001Beast \u6838\u5fc3 API\u3002\u534f\u7a0b\u4e0e Asio \u57fa\u7840\u4ec5\u505a\u6982\u89c8\u3002<\/p>\n<p><span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;boost\/beast\/core.hpp&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;boost\/beast\/http.hpp&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;boost\/beast\/version.hpp&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;boost\/asio.hpp&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;chrono&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;cstdlib&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;ctime&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;iostream&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;memory&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;string&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;json\/json.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;json\/value.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;json\/reader.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;boost\/asio\/co_spawn.hpp&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;boost\/asio\/detached.hpp&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;boost\/asio\/io_context.hpp&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;boost\/asio\/ip\/tcp.hpp&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;boost\/asio\/signal_set.hpp&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;boost\/asio\/write.hpp&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;boost\/asio\/this_coro.hpp&gt;<\/span>  <span class=\"token comment\">\/\/ \u534f\u7a0b\u5de5\u5177&#xff1a;\u83b7\u53d6 executor\u3001\u6267\u884c\u5668\u6807\u8bc6<\/span><\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u2500\u2500 \u547d\u540d\u7a7a\u95f4\u522b\u540d \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500<\/span><br \/>\n<span class=\"token keyword\">namespace<\/span> net  <span class=\"token operator\">&#061;<\/span> boost<span class=\"token double-colon punctuation\">::<\/span>asio<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">namespace<\/span> beast <span class=\"token operator\">&#061;<\/span> boost<span class=\"token double-colon punctuation\">::<\/span>beast<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">namespace<\/span> http  <span class=\"token operator\">&#061;<\/span> beast<span class=\"token double-colon punctuation\">::<\/span>http<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">using<\/span> tcp <span class=\"token operator\">&#061;<\/span> net<span class=\"token double-colon punctuation\">::<\/span>ip<span class=\"token double-colon punctuation\">::<\/span>tcp<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">using<\/span> boost<span class=\"token double-colon punctuation\">::<\/span>asio<span class=\"token double-colon punctuation\">::<\/span>awaitable<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">using<\/span> boost<span class=\"token double-colon punctuation\">::<\/span>asio<span class=\"token double-colon punctuation\">::<\/span>co_spawn<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">using<\/span> boost<span class=\"token double-colon punctuation\">::<\/span>asio<span class=\"token double-colon punctuation\">::<\/span>detached<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">using<\/span> boost<span class=\"token double-colon punctuation\">::<\/span>asio<span class=\"token double-colon punctuation\">::<\/span>use_awaitable<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">using<\/span> <span class=\"token keyword\">namespace<\/span> std<span class=\"token double-colon punctuation\">::<\/span>chrono_literals<span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u5b57\u9762\u91cf&#xff1a;60s<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u2500\u2500 \u7a0b\u5e8f\u5168\u5c40\u72b6\u6001&#xff1a;\u8bf7\u6c42\u8ba1\u6570 &#043; \u83b7\u53d6\u5f53\u524d\u65f6\u95f4 \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500<\/span><br \/>\n<span class=\"token comment\">\/\/    \u4e0e easy \u7248\u5171\u4eab\u540c\u6837\u7684\u5de5\u5177\u51fd\u6570<\/span><br \/>\n<span class=\"token keyword\">namespace<\/span> my_program_state <span class=\"token punctuation\">{<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u7ebf\u7a0b\u5b89\u5168\u7684\u8bf7\u6c42\u8ba1\u6570\u5668&#xff08;\u6bcf\u6b21\u8c03\u7528 &#043;1&#xff09;<\/span><br \/>\n    std<span class=\"token double-colon punctuation\">::<\/span>size_t <span class=\"token function\">request_count<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">static<\/span> std<span class=\"token double-colon punctuation\">::<\/span>size_t count <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token comment\">\/\/ \u6ce8\u610f&#xff1a;\u5728\u5355\u7ebf\u7a0b\u534f\u7a0b\u6a21\u578b\u4e0b\u65e0\u9700\u52a0\u9501&#xff1b;<\/span><br \/>\n        <span class=\"token comment\">\/\/       \u82e5\u6539\u4e3a\u591a\u7ebf\u7a0b ioc.run() \u5219\u9700\u8981\u7528 atomic \u6216 mutex<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token operator\">&#043;&#043;<\/span>count<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u83b7\u53d6\u5f53\u524d UNIX \u65f6\u95f4\u6233&#xff08;\u79d2&#xff09;<\/span><br \/>\n    std<span class=\"token double-colon punctuation\">::<\/span>time_t <span class=\"token function\">now<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> std<span class=\"token double-colon punctuation\">::<\/span><span class=\"token function\">time<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token punctuation\">}<\/span> <span class=\"token comment\">\/\/ namespace my_program_state<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u2500\u2500 \u534f\u7a0b\u8d85\u65f6\u5b88\u62a4 \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500<\/span><br \/>\n<span class=\"token comment\">\/\/ \u8be5\u534f\u7a0b\u5728\u6307\u5b9a duration \u540e\u5173\u95ed socket&#xff0c;\u4ece\u800c\u5f3a\u5236\u4e2d\u6b62 echo \u534f\u7a0b\u4e2d\u7684\u5f02\u6b65\u64cd\u4f5c\u3002<\/span><br \/>\n<span class=\"token comment\">\/\/ \u8c03\u7528\u8005\u7528 co_spawn \u542f\u52a8\u5b83\u5e76\u4f20\u5165 detached&#xff0c;\u8ba9\u5b83\u72ec\u7acb\u8fd0\u884c\u3002<\/span><br \/>\n<span class=\"token keyword\">template<\/span><span class=\"token operator\">&lt;<\/span><span class=\"token keyword\">typename<\/span> <span class=\"token class-name\">Socket<\/span><span class=\"token operator\">&gt;<\/span><br \/>\nawaitable<span class=\"token operator\">&lt;<\/span><span class=\"token keyword\">void<\/span><span class=\"token operator\">&gt;<\/span> <span class=\"token function\">watchdog<\/span><span class=\"token punctuation\">(<\/span>Socket<span class=\"token operator\">&amp;<\/span> socket<span class=\"token punctuation\">,<\/span> std<span class=\"token double-colon punctuation\">::<\/span>chrono<span class=\"token double-colon punctuation\">::<\/span>seconds duration<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u83b7\u53d6\u4e0e socket \u7ed1\u5b9a\u7684 executor&#xff08;\u5373\u540c\u4e00\u4e2a io_context&#xff09;<\/span><br \/>\n    <span class=\"token keyword\">auto<\/span> executor <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">co_await<\/span> boost<span class=\"token double-colon punctuation\">::<\/span>asio<span class=\"token double-colon punctuation\">::<\/span>this_coro<span class=\"token double-colon punctuation\">::<\/span>executor<span class=\"token punctuation\">;<\/span><br \/>\n    net<span class=\"token double-colon punctuation\">::<\/span>steady_timer <span class=\"token function\">timer<\/span><span class=\"token punctuation\">(<\/span>executor<span class=\"token punctuation\">,<\/span> duration<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u7b49\u5f85\u5b9a\u65f6\u5668\u5230\u671f&#xff1b;\u5982\u679c\u5b9a\u65f6\u5668\u88ab cancel() \u4f1a\u6536\u5230 operation_aborted<\/span><br \/>\n    beast<span class=\"token double-colon punctuation\">::<\/span>error_code ec<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">co_await<\/span> timer<span class=\"token punctuation\">.<\/span><span class=\"token function\">async_wait<\/span><span class=\"token punctuation\">(<\/span>net<span class=\"token double-colon punctuation\">::<\/span><span class=\"token function\">redirect_error<\/span><span class=\"token punctuation\">(<\/span>use_awaitable<span class=\"token punctuation\">,<\/span> ec<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u6b63\u5e38\u5230\u671f&#xff08;\u672a\u88ab\u53d6\u6d88&#xff09;\u2192 \u5173\u95ed socket \u4ee5\u4e2d\u6b62\u6302\u8d77\u7684 I\/O<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">!<\/span>ec<span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token comment\">\/\/ \u5ffd\u7565 close \u4ea7\u751f\u7684\u9519\u8bef&#xff08;socket \u53ef\u80fd\u5df2\u7ecf\u5173\u95ed&#xff09;<\/span><br \/>\n        socket<span class=\"token punctuation\">.<\/span><span class=\"token function\">close<\/span><span class=\"token punctuation\">(<\/span>ec<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u2500\u2500 \u5904\u7406\u5355\u4e2a HTTP \u8fde\u63a5\u7684\u534f\u7a0b \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500<\/span><br \/>\n<span class=\"token comment\">\/\/ \u4e0e easy \u7248 http_connection \u7c7b\u529f\u80fd\u5b8c\u5168\u7b49\u4ef7&#xff0c;\u4f46\u7528\u534f\u7a0b\u66ff\u4ee3\u5f02\u6b65\u56de\u8c03&#xff0c;<\/span><br \/>\n<span class=\"token comment\">\/\/ \u4ee3\u7801\u8bfb\u8d77\u6765\u50cf\u540c\u6b65\u6d41\u7a0b&#xff1a;read \u2192 process \u2192 write<\/span><br \/>\nawaitable<span class=\"token operator\">&lt;<\/span><span class=\"token keyword\">void<\/span><span class=\"token operator\">&gt;<\/span> <span class=\"token function\">echo<\/span><span class=\"token punctuation\">(<\/span>tcp<span class=\"token double-colon punctuation\">::<\/span>socket socket<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u2500\u2500 \u6b64\u534f\u7a0b\u5185\u6240\u6709\u5c40\u90e8\u53d8\u91cf\u90fd\u5b58\u6d3b\u5230\u534f\u7a0b\u7ed3\u675f \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u4e0d\u9700\u8981 shared_from_this \/ make_shared&#xff0c;\u534f\u7a0b\u5e27\u81ea\u52a8\u4fdd\u6709\u751f\u547d\u5468\u671f<\/span><br \/>\n    beast<span class=\"token double-colon punctuation\">::<\/span>flat_buffer           buffer<span class=\"token punctuation\">{<\/span><span class=\"token number\">8192<\/span><span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span>   <span class=\"token comment\">\/\/ 8KB \u8bfb\u5199\u7f13\u51b2<\/span><br \/>\n    http<span class=\"token double-colon punctuation\">::<\/span>request<span class=\"token operator\">&lt;<\/span>http<span class=\"token double-colon punctuation\">::<\/span>dynamic_body<span class=\"token operator\">&gt;<\/span>  request<span class=\"token punctuation\">;<\/span>   <span class=\"token comment\">\/\/ HTTP \u8bf7\u6c42<\/span><br \/>\n    http<span class=\"token double-colon punctuation\">::<\/span>response<span class=\"token operator\">&lt;<\/span>http<span class=\"token double-colon punctuation\">::<\/span>dynamic_body<span class=\"token operator\">&gt;<\/span> response<span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ HTTP \u54cd\u5e94<\/span><br \/>\n    beast<span class=\"token double-colon punctuation\">::<\/span>error_code                 ec<span class=\"token punctuation\">;<\/span>          <span class=\"token comment\">\/\/ \u9519\u8bef\u7801&#xff08;\u590d\u7528&#xff09;<\/span><br \/>\n    std<span class=\"token double-colon punctuation\">::<\/span>size_t                       nbytes<span class=\"token punctuation\">;<\/span>      <span class=\"token comment\">\/\/ \u4f20\u8f93\u5b57\u8282\u6570&#xff08;\u590d\u7528&#xff09;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u542f\u52a8\u8d85\u65f6\u5b88\u62a4\u534f\u7a0b&#xff1a;60 \u79d2\u540e\u82e5\u8fd8\u672a\u5b8c\u6210\u5219\u5173\u95ed socket<\/span><br \/>\n    <span class=\"token comment\">\/\/ detached \u21d2 \u4e0d\u7ba1\u5b83\u7684\u8fd4\u56de\u503c&#xff0c;\u8ba9\u5b83\u72ec\u7acb\u8fd0\u884c<\/span><br \/>\n    <span class=\"token function\">co_spawn<\/span><span class=\"token punctuation\">(<\/span><br \/>\n        socket<span class=\"token punctuation\">.<\/span><span class=\"token function\">get_executor<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><br \/>\n        <span class=\"token function\">watchdog<\/span><span class=\"token punctuation\">(<\/span>socket<span class=\"token punctuation\">,<\/span> <span class=\"token number\">60<\/span>s<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><br \/>\n        detached<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u2026\u2026 1. \u5f02\u6b65\u8bfb\u53d6\u5b8c\u6574\u7684 HTTP \u8bf7\u6c42 \u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026<\/span><br \/>\n    <span class=\"token comment\">\/\/     \u534f\u7a0b\u5728\u6b64\u5904\u6302\u8d77&#xff0c;\u76f4\u5230 http::async_read \u5b8c\u6210<\/span><br \/>\n    <span class=\"token comment\">\/\/     \u5982\u679c\u5728\u8bfb\u53d6\u671f\u95f4 socket \u8d85\u65f6\u5173\u95ed&#xff0c;ec \u4f1a\u5e26 operation_aborted<\/span><br \/>\n    <span class=\"token comment\">\/\/     redirect_error \u5c06\u5f02\u6b65\u64cd\u4f5c\u7684\u9519\u8bef\u7801\u5199\u5165 ec&#xff0c;co_await \u8fd4\u56de\u4f20\u8f93\u5b57\u8282\u6570<\/span><br \/>\n    nbytes <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">co_await<\/span> http<span class=\"token double-colon punctuation\">::<\/span><span class=\"token function\">async_read<\/span><span class=\"token punctuation\">(<\/span><br \/>\n        socket<span class=\"token punctuation\">,<\/span><br \/>\n        buffer<span class=\"token punctuation\">,<\/span><br \/>\n        request<span class=\"token punctuation\">,<\/span><br \/>\n        net<span class=\"token double-colon punctuation\">::<\/span><span class=\"token function\">redirect_error<\/span><span class=\"token punctuation\">(<\/span>use_awaitable<span class=\"token punctuation\">,<\/span> ec<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>ec<span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token keyword\">co_return<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u8bfb\u53d6\u5931\u8d25\u6216\u8d85\u65f6 \u2192 \u76f4\u63a5\u9000\u51fa<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u2026\u2026 2. \u6784\u9020\u54cd\u5e94 \u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u7ee7\u627f\u8bf7\u6c42\u7684 HTTP \u7248\u672c&#xff08;\u5982 HTTP\/1.1&#xff09;<\/span><br \/>\n    response<span class=\"token punctuation\">.<\/span><span class=\"token function\">version<\/span><span class=\"token punctuation\">(<\/span>request<span class=\"token punctuation\">.<\/span><span class=\"token function\">version<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u4e0d\u4fdd\u6301\u957f\u8fde\u63a5&#xff0c;\u6bcf\u6b21\u53ea\u5904\u7406\u4e00\u4e2a\u8bf7\u6c42-\u54cd\u5e94<\/span><br \/>\n    response<span class=\"token punctuation\">.<\/span><span class=\"token function\">keep_alive<\/span><span class=\"token punctuation\">(<\/span><span class=\"token boolean\">false<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">switch<\/span> <span class=\"token punctuation\">(<\/span>request<span class=\"token punctuation\">.<\/span><span class=\"token function\">method<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token comment\">\/\/ \u2500\u2500 GET \u8bf7\u6c42 \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500<\/span><br \/>\n            <span class=\"token keyword\">case<\/span> http<span class=\"token double-colon punctuation\">::<\/span>verb<span class=\"token double-colon punctuation\">::<\/span>get<span class=\"token operator\">:<\/span><br \/>\n                <span class=\"token punctuation\">{<\/span><br \/>\n                    response<span class=\"token punctuation\">.<\/span><span class=\"token function\">result<\/span><span class=\"token punctuation\">(<\/span>http<span class=\"token double-colon punctuation\">::<\/span>status<span class=\"token double-colon punctuation\">::<\/span>ok<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                    response<span class=\"token punctuation\">.<\/span><span class=\"token function\">set<\/span><span class=\"token punctuation\">(<\/span>http<span class=\"token double-colon punctuation\">::<\/span>field<span class=\"token double-colon punctuation\">::<\/span>server<span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;Beast&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>                    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>request<span class=\"token punctuation\">.<\/span><span class=\"token function\">target<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token string\">&#034;\/count&#034;<\/span><span class=\"token punctuation\">)<\/span><br \/>\n                    <span class=\"token punctuation\">{<\/span><br \/>\n                        <span class=\"token comment\">\/\/ \/count \u2192 \u8fd4\u56de\u8bf7\u6c42\u8ba1\u6570\u9875\u9762<\/span><br \/>\n                        response<span class=\"token punctuation\">.<\/span><span class=\"token function\">set<\/span><span class=\"token punctuation\">(<\/span>http<span class=\"token double-colon punctuation\">::<\/span>field<span class=\"token double-colon punctuation\">::<\/span>content_type<span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;text\/html&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                        beast<span class=\"token double-colon punctuation\">::<\/span><span class=\"token function\">ostream<\/span><span class=\"token punctuation\">(<\/span>response<span class=\"token punctuation\">.<\/span><span class=\"token function\">body<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><br \/>\n                            <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;&lt;html&gt;\\\\n&#034;<\/span><br \/>\n                            <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;&lt;head&gt;&lt;title&gt;Request count&lt;\/title&gt;&lt;\/head&gt;\\\\n&#034;<\/span><br \/>\n                            <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;&lt;body&gt;\\\\n&#034;<\/span><br \/>\n                            <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;&lt;h1&gt;Request count&lt;\/h1&gt;\\\\n&#034;<\/span><br \/>\n                            <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;&lt;p&gt;There have been &#034;<\/span><br \/>\n                            <span class=\"token operator\">&lt;&lt;<\/span> my_program_state<span class=\"token double-colon punctuation\">::<\/span><span class=\"token function\">request_count<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n                            <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034; requests so far.&lt;\/p&gt;\\\\n&#034;<\/span><br \/>\n                            <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;&lt;\/body&gt;\\\\n&#034;<\/span><br \/>\n                            <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;&lt;\/html&gt;\\\\n&#034;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                    <span class=\"token punctuation\">}<\/span><br \/>\n                    <span class=\"token keyword\">else<\/span> <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>request<span class=\"token punctuation\">.<\/span><span class=\"token function\">target<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token string\">&#034;\/time&#034;<\/span><span class=\"token punctuation\">)<\/span><br \/>\n                    <span class=\"token punctuation\">{<\/span><br \/>\n                        <span class=\"token comment\">\/\/ \/time \u2192 \u8fd4\u56de\u5f53\u524d\u65f6\u95f4\u6233\u9875\u9762<\/span><br \/>\n                        response<span class=\"token punctuation\">.<\/span><span class=\"token function\">set<\/span><span class=\"token punctuation\">(<\/span>http<span class=\"token double-colon punctuation\">::<\/span>field<span class=\"token double-colon punctuation\">::<\/span>content_type<span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;text\/html&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                        beast<span class=\"token double-colon punctuation\">::<\/span><span class=\"token function\">ostream<\/span><span class=\"token punctuation\">(<\/span>response<span class=\"token punctuation\">.<\/span><span class=\"token function\">body<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><br \/>\n                            <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;&lt;html&gt;\\\\n&#034;<\/span><br \/>\n                            <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;&lt;head&gt;&lt;title&gt;Current time&lt;\/title&gt;&lt;\/head&gt;\\\\n&#034;<\/span><br \/>\n                            <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;&lt;body&gt;\\\\n&#034;<\/span><br \/>\n                            <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;&lt;h1&gt;Current time&lt;\/h1&gt;\\\\n&#034;<\/span><br \/>\n                            <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;&lt;p&gt;The current time is &#034;<\/span><br \/>\n                            <span class=\"token operator\">&lt;&lt;<\/span> my_program_state<span class=\"token double-colon punctuation\">::<\/span><span class=\"token function\">now<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n                            <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034; seconds since the epoch.&lt;\/p&gt;\\\\n&#034;<\/span><br \/>\n                            <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;&lt;\/body&gt;\\\\n&#034;<\/span><br \/>\n                            <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;&lt;\/html&gt;\\\\n&#034;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                    <span class=\"token punctuation\">}<\/span><br \/>\n                    <span class=\"token keyword\">else<\/span><br \/>\n                    <span class=\"token punctuation\">{<\/span><br \/>\n                        <span class=\"token comment\">\/\/ \u5176\u4ed6 GET \u8def\u5f84 \u2192 404<\/span><br \/>\n                        response<span class=\"token punctuation\">.<\/span><span class=\"token function\">result<\/span><span class=\"token punctuation\">(<\/span>http<span class=\"token double-colon punctuation\">::<\/span>status<span class=\"token double-colon punctuation\">::<\/span>not_found<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                        response<span class=\"token punctuation\">.<\/span><span class=\"token function\">set<\/span><span class=\"token punctuation\">(<\/span>http<span class=\"token double-colon punctuation\">::<\/span>field<span class=\"token double-colon punctuation\">::<\/span>content_type<span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;text\/plain&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                        beast<span class=\"token double-colon punctuation\">::<\/span><span class=\"token function\">ostream<\/span><span class=\"token punctuation\">(<\/span>response<span class=\"token punctuation\">.<\/span><span class=\"token function\">body<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;File not found\\\\r\\\\n&#034;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                    <span class=\"token punctuation\">}<\/span><br \/>\n                    <span class=\"token keyword\">break<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token punctuation\">}<\/span><\/p>\n<p>            <span class=\"token comment\">\/\/ \u2500\u2500 POST \u8bf7\u6c42 \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500<\/span><br \/>\n            <span class=\"token keyword\">case<\/span> http<span class=\"token double-colon punctuation\">::<\/span>verb<span class=\"token double-colon punctuation\">::<\/span>post<span class=\"token operator\">:<\/span><br \/>\n                <span class=\"token punctuation\">{<\/span><br \/>\n                    response<span class=\"token punctuation\">.<\/span><span class=\"token function\">result<\/span><span class=\"token punctuation\">(<\/span>http<span class=\"token double-colon punctuation\">::<\/span>status<span class=\"token double-colon punctuation\">::<\/span>ok<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                    response<span class=\"token punctuation\">.<\/span><span class=\"token function\">set<\/span><span class=\"token punctuation\">(<\/span>http<span class=\"token double-colon punctuation\">::<\/span>field<span class=\"token double-colon punctuation\">::<\/span>server<span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;Beast&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>                    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>request<span class=\"token punctuation\">.<\/span><span class=\"token function\">target<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token string\">&#034;\/email&#034;<\/span><span class=\"token punctuation\">)<\/span><br \/>\n                    <span class=\"token punctuation\">{<\/span><br \/>\n                        <span class=\"token comment\">\/\/ \u83b7\u53d6\u8bf7\u6c42\u4f53\u6570\u636e<\/span><br \/>\n                        <span class=\"token keyword\">auto<\/span><span class=\"token operator\">&amp;<\/span> body <span class=\"token operator\">&#061;<\/span> request<span class=\"token punctuation\">.<\/span><span class=\"token function\">body<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                        <span class=\"token keyword\">auto<\/span> body_str <span class=\"token operator\">&#061;<\/span> boost<span class=\"token double-colon punctuation\">::<\/span>beast<span class=\"token double-colon punctuation\">::<\/span><span class=\"token function\">buffers_to_string<\/span><span class=\"token punctuation\">(<\/span>body<span class=\"token punctuation\">.<\/span><span class=\"token function\">data<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                        std<span class=\"token double-colon punctuation\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;receive body is &#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> body_str <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token double-colon punctuation\">::<\/span>endl<span class=\"token punctuation\">;<\/span><\/p>\n<p>                        response<span class=\"token punctuation\">.<\/span><span class=\"token function\">set<\/span><span class=\"token punctuation\">(<\/span>http<span class=\"token double-colon punctuation\">::<\/span>field<span class=\"token double-colon punctuation\">::<\/span>content_type<span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;text\/json&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>                        <span class=\"token comment\">\/\/ \u7528 jsoncpp \u89e3\u6790 POST \u7684 JSON \u6570\u636e<\/span><br \/>\n                        Json<span class=\"token double-colon punctuation\">::<\/span>Value root<span class=\"token punctuation\">;<\/span><br \/>\n                        Json<span class=\"token double-colon punctuation\">::<\/span>Reader reader<span class=\"token punctuation\">;<\/span><br \/>\n                        Json<span class=\"token double-colon punctuation\">::<\/span>Value src_root<span class=\"token punctuation\">;<\/span><br \/>\n                        <span class=\"token keyword\">bool<\/span> parse_success <span class=\"token operator\">&#061;<\/span> reader<span class=\"token punctuation\">.<\/span><span class=\"token function\">parse<\/span><span class=\"token punctuation\">(<\/span>body_str<span class=\"token punctuation\">,<\/span> src_root<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">!<\/span>parse_success<span class=\"token punctuation\">)<\/span><br \/>\n                        <span class=\"token punctuation\">{<\/span><br \/>\n                            <span class=\"token comment\">\/\/ JSON \u89e3\u6790\u5931\u8d25 \u2192 \u8fd4\u56de error: 1001<\/span><br \/>\n                            std<span class=\"token double-colon punctuation\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;Failed to parse JSON data!&#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token double-colon punctuation\">::<\/span>endl<span class=\"token punctuation\">;<\/span><br \/>\n                            root<span class=\"token punctuation\">[<\/span><span class=\"token string\">&#034;error&#034;<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">1001<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                            std<span class=\"token double-colon punctuation\">::<\/span>string jsonstr <span class=\"token operator\">&#061;<\/span> root<span class=\"token punctuation\">.<\/span><span class=\"token function\">toStyledString<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                            beast<span class=\"token double-colon punctuation\">::<\/span><span class=\"token function\">ostream<\/span><span class=\"token punctuation\">(<\/span>response<span class=\"token punctuation\">.<\/span><span class=\"token function\">body<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&lt;&lt;<\/span> jsonstr<span class=\"token punctuation\">;<\/span><br \/>\n                            <span class=\"token keyword\">break<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u8df3\u51fa switch&#xff0c;\u53bb\u5199\u54cd\u5e94<\/span><br \/>\n                        <span class=\"token punctuation\">}<\/span><\/p>\n<p>                        <span class=\"token keyword\">auto<\/span> email <span class=\"token operator\">&#061;<\/span> src_root<span class=\"token punctuation\">[<\/span><span class=\"token string\">&#034;email&#034;<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">asString<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                        std<span class=\"token double-colon punctuation\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;email is &#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> email <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token double-colon punctuation\">::<\/span>endl<span class=\"token punctuation\">;<\/span><\/p>\n<p>                        <span class=\"token comment\">\/\/ \u6784\u9020\u6210\u529f\u54cd\u5e94 JSON<\/span><br \/>\n                        root<span class=\"token punctuation\">[<\/span><span class=\"token string\">&#034;error&#034;<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                        root<span class=\"token punctuation\">[<\/span><span class=\"token string\">&#034;email&#034;<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> src_root<span class=\"token punctuation\">[<\/span><span class=\"token string\">&#034;email&#034;<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                        root<span class=\"token punctuation\">[<\/span><span class=\"token string\">&#034;msg&#034;<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#034;recevie email post success&#034;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                        std<span class=\"token double-colon punctuation\">::<\/span>string jsonstr <span class=\"token operator\">&#061;<\/span> root<span class=\"token punctuation\">.<\/span><span class=\"token function\">toStyledString<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                        beast<span class=\"token double-colon punctuation\">::<\/span><span class=\"token function\">ostream<\/span><span class=\"token punctuation\">(<\/span>response<span class=\"token punctuation\">.<\/span><span class=\"token function\">body<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&lt;&lt;<\/span> jsonstr<span class=\"token punctuation\">;<\/span><br \/>\n                    <span class=\"token punctuation\">}<\/span><br \/>\n                    <span class=\"token keyword\">else<\/span><br \/>\n                    <span class=\"token punctuation\">{<\/span><br \/>\n                        <span class=\"token comment\">\/\/ \u672a\u77e5 POST \u8def\u5f84 \u2192 404<\/span><br \/>\n                        response<span class=\"token punctuation\">.<\/span><span class=\"token function\">result<\/span><span class=\"token punctuation\">(<\/span>http<span class=\"token double-colon punctuation\">::<\/span>status<span class=\"token double-colon punctuation\">::<\/span>not_found<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                        response<span class=\"token punctuation\">.<\/span><span class=\"token function\">set<\/span><span class=\"token punctuation\">(<\/span>http<span class=\"token double-colon punctuation\">::<\/span>field<span class=\"token double-colon punctuation\">::<\/span>content_type<span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;text\/plain&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                        beast<span class=\"token double-colon punctuation\">::<\/span><span class=\"token function\">ostream<\/span><span class=\"token punctuation\">(<\/span>response<span class=\"token punctuation\">.<\/span><span class=\"token function\">body<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;File not found\\\\r\\\\n&#034;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                    <span class=\"token punctuation\">}<\/span><br \/>\n                    <span class=\"token keyword\">break<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token punctuation\">}<\/span><\/p>\n<p>            <span class=\"token keyword\">default<\/span><span class=\"token operator\">:<\/span><br \/>\n                <span class=\"token comment\">\/\/ \u4e0d\u652f\u6301\u7684\u65b9\u6cd5 \u2192 400 Bad Request<\/span><br \/>\n                response<span class=\"token punctuation\">.<\/span><span class=\"token function\">result<\/span><span class=\"token punctuation\">(<\/span>http<span class=\"token double-colon punctuation\">::<\/span>status<span class=\"token double-colon punctuation\">::<\/span>bad_request<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                response<span class=\"token punctuation\">.<\/span><span class=\"token function\">set<\/span><span class=\"token punctuation\">(<\/span>http<span class=\"token double-colon punctuation\">::<\/span>field<span class=\"token double-colon punctuation\">::<\/span>content_type<span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;text\/plain&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                beast<span class=\"token double-colon punctuation\">::<\/span><span class=\"token function\">ostream<\/span><span class=\"token punctuation\">(<\/span>response<span class=\"token punctuation\">.<\/span><span class=\"token function\">body<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><br \/>\n                    <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;Invalid request-method &#039;&#034;<\/span><br \/>\n                    <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token double-colon punctuation\">::<\/span><span class=\"token function\">string<\/span><span class=\"token punctuation\">(<\/span>request<span class=\"token punctuation\">.<\/span><span class=\"token function\">method_string<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><br \/>\n                    <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;&#039;&#034;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token keyword\">break<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u2026\u2026 3. \u5f02\u6b65\u53d1\u9001\u54cd\u5e94 \u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026<\/span><br \/>\n    response<span class=\"token punctuation\">.<\/span><span class=\"token function\">content_length<\/span><span class=\"token punctuation\">(<\/span>response<span class=\"token punctuation\">.<\/span><span class=\"token function\">body<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">size<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ redirect_error \u5c06\u9519\u8bef\u5199\u5165 ec&#xff0c;co_await \u8fd4\u56de\u5b9e\u9645\u4f20\u8f93\u7684\u5b57\u8282\u6570<\/span><br \/>\n    nbytes <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">co_await<\/span> http<span class=\"token double-colon punctuation\">::<\/span><span class=\"token function\">async_write<\/span><span class=\"token punctuation\">(<\/span><br \/>\n        socket<span class=\"token punctuation\">,<\/span><br \/>\n        response<span class=\"token punctuation\">,<\/span><br \/>\n        net<span class=\"token double-colon punctuation\">::<\/span><span class=\"token function\">redirect_error<\/span><span class=\"token punctuation\">(<\/span>use_awaitable<span class=\"token punctuation\">,<\/span> ec<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>ec<span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token keyword\">co_return<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u5199\u5165\u5931\u8d25 \u2192 \u76f4\u63a5\u9000\u51fa<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u4f18\u96c5\u5173\u95ed&#xff1a;\u53d1\u9001 TCP FIN<\/span><br \/>\n    <span class=\"token comment\">\/\/ &#xff08;\u6ce8\u610f\u534f\u7a0b\u5185 socket \u751f\u547d\u5468\u671f\u7531 echo \u534f\u7a0b\u638c\u63a7&#xff0c;\u9000\u51fa\u540e\u81ea\u52a8\u6790\u6784&#xff09;<\/span><br \/>\n    socket<span class=\"token punctuation\">.<\/span><span class=\"token function\">shutdown<\/span><span class=\"token punctuation\">(<\/span>tcp<span class=\"token double-colon punctuation\">::<\/span>socket<span class=\"token double-colon punctuation\">::<\/span>shutdown_send<span class=\"token punctuation\">,<\/span> ec<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u5ffd\u7565 shutdown \u9519\u8bef&#xff0c;\u4e0d\u518d\u5173\u5fc3<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u2500\u2500 \u76d1\u542c\u4e0e\u63a5\u53d7\u8fde\u63a5\u7684\u534f\u7a0b \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500<\/span><br \/>\n<span class=\"token comment\">\/\/ \u5728\u65e0\u9650\u5faa\u73af\u4e2d accept \u65b0\u8fde\u63a5&#xff0c;\u6bcf\u4e2a\u8fde\u63a5\u4ea4\u7ed9\u4e00\u4e2a echo \u534f\u7a0b\u5904\u7406<\/span><br \/>\nawaitable<span class=\"token operator\">&lt;<\/span><span class=\"token keyword\">void<\/span><span class=\"token operator\">&gt;<\/span> <span class=\"token function\">listener<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">auto<\/span> executor <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">co_await<\/span> boost<span class=\"token double-colon punctuation\">::<\/span>asio<span class=\"token double-colon punctuation\">::<\/span>this_coro<span class=\"token double-colon punctuation\">::<\/span>executor<span class=\"token punctuation\">;<\/span><br \/>\n    tcp<span class=\"token double-colon punctuation\">::<\/span>acceptor <span class=\"token function\">acceptor<\/span><span class=\"token punctuation\">(<\/span>executor<span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">{<\/span>tcp<span class=\"token double-colon punctuation\">::<\/span><span class=\"token function\">v4<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">10086<\/span><span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">;<\/span><span class=\"token punctuation\">;<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token comment\">\/\/ co_await async_accept \u2192 \u534f\u7a0b\u6302\u8d77\u5230\u6709\u5ba2\u6237\u7aef\u8fde\u63a5\u4e3a\u6b62<\/span><br \/>\n            tcp<span class=\"token double-colon punctuation\">::<\/span>socket socket <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">co_await<\/span> acceptor<span class=\"token punctuation\">.<\/span><span class=\"token function\">async_accept<\/span><span class=\"token punctuation\">(<\/span>use_awaitable<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token comment\">\/\/ \u4e3a\u6bcf\u4e2a\u8fde\u63a5\u542f\u52a8\u4e00\u4e2a echo \u534f\u7a0b&#xff08;detached \u4e0d\u5173\u5fc3\u8fd4\u56de\u503c&#xff09;<\/span><br \/>\n            <span class=\"token function\">co_spawn<\/span><span class=\"token punctuation\">(<\/span>executor<span class=\"token punctuation\">,<\/span> <span class=\"token function\">echo<\/span><span class=\"token punctuation\">(<\/span>std<span class=\"token double-colon punctuation\">::<\/span><span class=\"token function\">move<\/span><span class=\"token punctuation\">(<\/span>socket<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> detached<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u2500\u2500 \u5165\u53e3 \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500<\/span><br \/>\n<span class=\"token keyword\">int<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">try<\/span><br \/>\n        <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token comment\">\/\/ io_context \u2014 ASIO \u7684\u4e8b\u4ef6\u5faa\u73af\u5f15\u64ce<\/span><br \/>\n            net<span class=\"token double-colon punctuation\">::<\/span>io_context ioc<span class=\"token punctuation\">{<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>            <span class=\"token comment\">\/\/ \u6ce8\u518c\u4fe1\u53f7\u76d1\u542c&#xff08;SIGINT \/ SIGTERM&#xff09;&#xff0c;\u7528\u4e8e\u4f18\u96c5\u9000\u51fa<\/span><br \/>\n            net<span class=\"token double-colon punctuation\">::<\/span>signal_set <span class=\"token function\">signals<\/span><span class=\"token punctuation\">(<\/span>ioc<span class=\"token punctuation\">,<\/span> SIGINT<span class=\"token punctuation\">,<\/span> SIGTERM<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            signals<span class=\"token punctuation\">.<\/span><span class=\"token function\">async_wait<\/span><span class=\"token punctuation\">(<\/span><br \/>\n                <span class=\"token punctuation\">[<\/span><span class=\"token operator\">&amp;<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">(<\/span>beast<span class=\"token double-colon punctuation\">::<\/span>error_code ec<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> <span class=\"token comment\">\/*signal_number*\/<\/span><span class=\"token punctuation\">)<\/span><br \/>\n                <span class=\"token punctuation\">{<\/span><br \/>\n                    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">!<\/span>ec<span class=\"token punctuation\">)<\/span><br \/>\n                        ioc<span class=\"token punctuation\">.<\/span><span class=\"token function\">stop<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u505c\u6b62 io_context::run()<\/span><br \/>\n                <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>            <span class=\"token comment\">\/\/ \u4ee5 detached \u6a21\u5f0f\u542f\u52a8\u76d1\u542c\u534f\u7a0b&#xff08;\u4e0d\u7b49\u5f85\u8fd4\u56de\u503c&#xff09;<\/span><br \/>\n            <span class=\"token function\">co_spawn<\/span><span class=\"token punctuation\">(<\/span>ioc<span class=\"token punctuation\">,<\/span> <span class=\"token function\">listener<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> detached<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>            <span class=\"token comment\">\/\/ \u542f\u52a8\u4e8b\u4ef6\u5faa\u73af&#xff1b;\u963b\u585e\u76f4\u5230 ioc.stop() \u88ab\u8c03\u7528<\/span><br \/>\n            ioc<span class=\"token punctuation\">.<\/span><span class=\"token function\">run<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>            std<span class=\"token double-colon punctuation\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;Server stopped gracefully.&#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token double-colon punctuation\">::<\/span>endl<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">catch<\/span> <span class=\"token punctuation\">(<\/span>std<span class=\"token double-colon punctuation\">::<\/span>exception <span class=\"token keyword\">const<\/span><span class=\"token operator\">&amp;<\/span> e<span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token punctuation\">{<\/span><br \/>\n            std<span class=\"token double-colon punctuation\">::<\/span>cerr <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;Error: &#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> e<span class=\"token punctuation\">.<\/span><span class=\"token function\">what<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token double-colon punctuation\">::<\/span>endl<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">return<\/span> EXIT_FAILURE<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> EXIT_SUCCESS<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<hr \/>\n<h3>\u6574\u4f53\u67b6\u6784<\/h3>\n<p>\u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510<br \/>\n\u2502                    main()                            \u2502<br \/>\n\u2502  \u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510  \u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510  \u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510  \u2502<br \/>\n\u2502  \u2502 io_context\u2502  \u2502 signals  \u2502  \u2502 co_spawn(ioc,    \u2502  \u2502<br \/>\n\u2502  \u2502   ioc{1}  \u2502  \u2502 (SIGINT) \u2502  \u2502   listener(),    \u2502  \u2502<br \/>\n\u2502  \u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518  \u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518  \u2502   detached)       \u2502  \u2502<br \/>\n\u2502       \u2502                       \u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518  \u2502<br \/>\n\u2502       \u2502                              \u2502               \u2502<br \/>\n\u2502       \u25bc                              \u25bc               \u2502<br \/>\n\u2502   ioc.run()              \u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510  \u2502<br \/>\n\u2502   (\u963b\u585e\u4e8b\u4ef6\u5faa\u73af)           \u2502  listener() \u534f\u7a0b       \u2502  \u2502<br \/>\n\u2502                           \u2502  \u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510 \u2502  \u2502<br \/>\n\u2502                           \u2502  \u2502 tcp::acceptor    \u2502 \u2502  \u2502<br \/>\n\u2502                           \u2502  \u2502 bind 0.0.0.0:   \u2502 \u2502  \u2502<br \/>\n\u2502                           \u2502  \u2502       10086      \u2502 \u2502  \u2502<br \/>\n\u2502                           \u2502  \u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518 \u2502  \u2502<br \/>\n\u2502                           \u2502  for(;;) {           \u2502  \u2502<br \/>\n\u2502                           \u2502    socket &#061; co_await \u2502  \u2502<br \/>\n\u2502                           \u2502      async_accept(); \u2502  \u2502<br \/>\n\u2502                           \u2502    co_spawn(echo(    \u2502  \u2502<br \/>\n\u2502                           \u2502      socket),        \u2502  \u2502<br \/>\n\u2502                           \u2502      detached);      \u2502  \u2502<br \/>\n\u2502                           \u2502  }                   \u2502  \u2502<br \/>\n\u2502                           \u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518  \u2502<br \/>\n\u2502                                      \u2502               \u2502<br \/>\n\u2502                    \u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518               \u2502<br \/>\n\u2502                    \u25bc                                 \u2502<br \/>\n\u2502         \u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510                 \u2502<br \/>\n\u2502         \u2502  echo(socket) \u534f\u7a0b       \u2502  (\u6bcf\u4e2a\u8fde\u63a5\u4e00\u4e2a)  \u2502<br \/>\n\u2502         \u2502                         \u2502                 \u2502<br \/>\n\u2502         \u2502  1. \u542f\u52a8 watchdog(60s)  \u2502                 \u2502<br \/>\n\u2502         \u2502  2. co_await async_read \u2502                 \u2502<br \/>\n\u2502         \u2502  3. process_request()   \u2502                 \u2502<br \/>\n\u2502         \u2502  4. co_await async_write\u2502                 \u2502<br \/>\n\u2502         \u2502  5. socket.shutdown()   \u2502                 \u2502<br \/>\n\u2502         \u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518                 \u2502<br \/>\n\u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518<\/p>\n<p>\u5173\u952e\u8bbe\u8ba1\u70b9&#xff1a;<\/p>\n<table>\n<tr>\u8bbe\u8ba1\u51b3\u7b56\u8bf4\u660e<\/tr>\n<tbody>\n<tr>\n<td>\u5355\u7ebf\u7a0b io_context{1}<\/td>\n<td>\u65e0\u9700\u4e92\u65a5\u9501&#xff0c;\u6240\u6709\u534f\u7a0b\u5728\u540c\u4e00\u7ebf\u7a0b\u4e0a\u534f\u4f5c\u8c03\u5ea6<\/td>\n<\/tr>\n<tr>\n<td>\u6bcf\u8fde\u63a5\u4e00\u534f\u7a0b<\/td>\n<td>echo() \u534f\u7a0b\u72ec\u7acb\u7ba1\u7406\u4e00\u4e2a\u8fde\u63a5\u7684\u5168\u751f\u547d\u5468\u671f<\/td>\n<\/tr>\n<tr>\n<td>\u8d85\u65f6\u5b88\u62a4\u534f\u7a0b<\/td>\n<td>watchdog() \u4ee5 detached \u6a21\u5f0f\u8fd0\u884c&#xff0c;\u8d85\u65f6\u76f4\u63a5 socket.close() \u5f3a\u884c\u4e2d\u65ad I\/O<\/td>\n<\/tr>\n<tr>\n<td>\u5c40\u90e8\u53d8\u91cf\u5373\u72b6\u6001<\/td>\n<td>\u534f\u7a0b\u5e27\u81ea\u52a8\u4fdd\u5b58\u5c40\u90e8\u53d8\u91cf&#xff0c;\u4e0d\u9700\u8981 shared_ptr \/ enable_shared_from_this<\/td>\n<\/tr>\n<tr>\n<td>detached \u542f\u52a8<\/td>\n<td>listener \u548c echo \u5747\u4ee5 detached \u542f\u52a8&#xff0c;fire-and-forget \u6a21\u5f0f<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u4e0e\u56de\u8c03\u7248 (http_server_sync_easy.cpp) \u7684\u6838\u5fc3\u5dee\u5f02&#xff1a;<\/p>\n<table>\n<tr>\u7279\u6027\u56de\u8c03\u7248\u534f\u7a0b\u7248<\/tr>\n<tbody>\n<tr>\n<td>\u751f\u547d\u5468\u671f\u7ba1\u7406<\/td>\n<td>shared_ptr &#043; enable_shared_from_this<\/td>\n<td>\u534f\u7a0b\u5e27\u81ea\u52a8\u7ba1\u7406<\/td>\n<\/tr>\n<tr>\n<td>\u63a7\u5236\u6d41<\/td>\n<td>\u591a\u5c42\u5d4c\u5957\u56de\u8c03<\/td>\n<td>\u7ebf\u6027 co_await&#xff0c;\u8bfb\u8d77\u6765\u50cf\u540c\u6b65\u4ee3\u7801<\/td>\n<\/tr>\n<tr>\n<td>\u9519\u8bef\u5904\u7406<\/td>\n<td>\u6bcf\u4e2a\u56de\u8c03\u68c0\u67e5 ec<\/td>\n<td>redirect_error \u7edf\u4e00\u5199\u5165 ec&#xff0c;\u5355\u4e00\u68c0\u67e5\u70b9<\/td>\n<\/tr>\n<tr>\n<td>\u8d85\u65f6\u5b9e\u73b0<\/td>\n<td>steady_timer &#043; \u56de\u8c03<\/td>\n<td>\u72ec\u7acb\u534f\u7a0b watchdog()<\/td>\n<\/tr>\n<tr>\n<td>C&#043;&#043; \u6807\u51c6<\/td>\n<td>C&#043;&#043;17<\/td>\n<td>C&#043;&#043;20&#xff08;\u534f\u7a0b\u9700\u8981&#xff09;<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<hr \/>\n<h3>\u6838\u5fc3\u4f9d\u8d56\u4e0e\u7f16\u8bd1\u914d\u7f6e<\/h3>\n<h4>CMakeLists.txt \u5173\u952e\u914d\u7f6e<\/h4>\n<p>cmake_minimum_required(VERSION 3.16)<br \/>\nproject(beast-http-sync-server VERSION 1.0.0 LANGUAGES CXX)<\/p>\n<p># \u534f\u7a0b\u7248\u9700\u8981 C&#043;&#043;20&#xff08;co_await \/ co_return \/ co_spawn&#xff09;<br \/>\nset(CMAKE_CXX_STANDARD 17)  # easy \u7248\u7528 C&#043;&#043;17<br \/>\n# &#8230;<br \/>\ntarget_compile_features(http-server-sync-coro PRIVATE cxx_std_20)<\/p>\n<p>target_link_libraries(http-server-sync-coro PRIVATE<br \/>\n    Boost::system      # boost::system::error_code<br \/>\n    Threads::Threads   # pthread (Asio \u5185\u90e8\u4f7f\u7528)<br \/>\n    JsonCpp::JsonCpp   # JSON \u89e3\u6790&#xff08;POST \/email&#xff09;<br \/>\n)<\/p>\n<h4>\u5934\u6587\u4ef6\u6e05\u5355\u4e0e\u4f5c\u7528<\/h4>\n<p><span class=\"token comment\">\/\/ \u2500\u2500 Beast \u2500\u2500<\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;boost\/beast\/core.hpp&gt;<\/span>      <span class=\"token comment\">\/\/ flat_buffer, error_code, ostream, buffers_to_string<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;boost\/beast\/http.hpp&gt;<\/span>      <span class=\"token comment\">\/\/ http::request, http::response, async_read, async_write<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;boost\/beast\/version.hpp&gt;<\/span>   <span class=\"token comment\">\/\/ BOOST_BEAST_VERSION \u5b8f<\/span><\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u2500\u2500 Asio \u2500\u2500<\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;boost\/asio.hpp&gt;<\/span>            <span class=\"token comment\">\/\/ io_context \u6838\u5fc3<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;boost\/asio\/co_spawn.hpp&gt;<\/span>   <span class=\"token comment\">\/\/ co_spawn() \u2014 \u542f\u52a8\u534f\u7a0b<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;boost\/asio\/detached.hpp&gt;<\/span>   <span class=\"token comment\">\/\/ detached \u2014 fire-and-forget \u6a21\u5f0f<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;boost\/asio\/io_context.hpp&gt;<\/span> <span class=\"token comment\">\/\/ io_context \u5177\u4f53\u5b9a\u4e49<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;boost\/asio\/ip\/tcp.hpp&gt;<\/span>     <span class=\"token comment\">\/\/ tcp::socket, tcp::acceptor<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;boost\/asio\/signal_set.hpp&gt;<\/span> <span class=\"token comment\">\/\/ SIGINT\/SIGTERM \u4fe1\u53f7\u5904\u7406<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;boost\/asio\/write.hpp&gt;<\/span>      <span class=\"token comment\">\/\/ \u901a\u7528\u5199\u64cd\u4f5c<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;boost\/asio\/this_coro.hpp&gt;<\/span>  <span class=\"token comment\">\/\/ this_coro::executor \u2014 \u534f\u7a0b\u5185\u83b7\u53d6 executor<\/span><\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u2500\u2500 \u7b2c\u4e09\u65b9 \u2500\u2500<\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;json\/json.h&gt;<\/span>               <span class=\"token comment\">\/\/ JsonCpp<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;json\/value.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;json\/reader.h&gt;<\/span><\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u2500\u2500 \u6807\u51c6\u5e93 \u2500\u2500<\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;chrono&gt;<\/span>    <span class=\"token comment\">\/\/ std::chrono::seconds<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;cstdlib&gt;<\/span>   <span class=\"token comment\">\/\/ EXIT_SUCCESS \/ EXIT_FAILURE<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;ctime&gt;<\/span>     <span class=\"token comment\">\/\/ std::time()<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;iostream&gt;<\/span>  <span class=\"token comment\">\/\/ std::cout, std::cerr<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;memory&gt;<\/span>    <span class=\"token comment\">\/\/ std::make_shared (\u56de\u8c03\u7248\u7528)<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;string&gt;<\/span>    <span class=\"token comment\">\/\/ std::string<\/span><\/span><\/p>\n<hr \/>\n<h3>Beast HTTP \u6838\u5fc3 API \u6df1\u5165<\/h3>\n<p>\u8fd9\u662f\u672c\u6587\u6863\u7684\u6838\u5fc3\u7ae0\u8282\u3002\u7406\u89e3\u8fd9\u4e9b\u7c7b\u578b\u548c API \u540e&#xff0c;\u4f60\u5c31\u53ef\u4ee5\u7528 Beast \u5904\u7406\u4efb\u610f HTTP \u6d88\u606f\u3002<\/p>\n<h4>\u547d\u540d\u7a7a\u95f4\u7ea6\u5b9a<\/h4>\n<p><span class=\"token keyword\">namespace<\/span> beast <span class=\"token operator\">&#061;<\/span> boost<span class=\"token double-colon punctuation\">::<\/span>beast<span class=\"token punctuation\">;<\/span>   <span class=\"token comment\">\/\/ Beast \u5e93\u9876\u5c42<\/span><br \/>\n<span class=\"token keyword\">namespace<\/span> http  <span class=\"token operator\">&#061;<\/span> beast<span class=\"token double-colon punctuation\">::<\/span>http<span class=\"token punctuation\">;<\/span>    <span class=\"token comment\">\/\/ HTTP \u534f\u8bae\u5b50\u6a21\u5757&#xff08;\u6838\u5fc3&#xff09;<\/span><br \/>\n<span class=\"token keyword\">namespace<\/span> net   <span class=\"token operator\">&#061;<\/span> boost<span class=\"token double-colon punctuation\">::<\/span>asio<span class=\"token punctuation\">;<\/span>    <span class=\"token comment\">\/\/ Asio \u7f51\u7edc\u5e93<\/span><br \/>\n<span class=\"token keyword\">using<\/span> tcp <span class=\"token operator\">&#061;<\/span> net<span class=\"token double-colon punctuation\">::<\/span>ip<span class=\"token double-colon punctuation\">::<\/span>tcp<span class=\"token punctuation\">;<\/span>        <span class=\"token comment\">\/\/ TCP \u534f\u8bae\u7c7b\u578b<\/span><\/p>\n<h4>http::request&lt;Body&gt; \u2014 HTTP \u8bf7\u6c42<\/h4>\n<p><span class=\"token comment\">\/\/ \u6a21\u677f\u58f0\u660e&#xff08;\u7b80\u5316&#xff09;<\/span><br \/>\n<span class=\"token keyword\">namespace<\/span> boost<span class=\"token double-colon punctuation\">::<\/span>beast<span class=\"token double-colon punctuation\">::<\/span>http <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">template<\/span><span class=\"token operator\">&lt;<\/span><span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Body<\/span><span class=\"token operator\">&gt;<\/span><br \/>\n    <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">request<\/span> <span class=\"token operator\">:<\/span> <span class=\"token base-clause\"><span class=\"token keyword\">public<\/span> <span class=\"token class-name\">header<\/span><span class=\"token operator\">&lt;<\/span><span class=\"token class-name\">true<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">fields<\/span><span class=\"token operator\">&gt;<\/span><\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token comment\">\/\/ &#8230;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>**\u6a21\u677f\u53c2\u6570 **Body \u51b3\u5b9a\u8bf7\u6c42\u4f53\u7684\u5b58\u50a8\u65b9\u5f0f&#xff1a;<\/p>\n<table>\n<tr>Body \u7c7b\u578b\u5185\u90e8\u5b58\u50a8\u9002\u7528\u573a\u666f<\/tr>\n<tbody>\n<tr>\n<td>http::dynamic_body<\/td>\n<td>basic_multi_buffer&#xff08;\u94fe\u8868\u5f0f\u7f13\u51b2\u533a&#xff09;<\/td>\n<td>\u901a\u7528\u573a\u666f&#xff0c;\u4e0d\u786e\u5b9a\u5927\u5c0f\u7684 body<\/td>\n<\/tr>\n<tr>\n<td>http::string_body<\/td>\n<td>std::string<\/td>\n<td>\u5df2\u77e5\u8f83\u5c0f\u7684\u6587\u672c body<\/td>\n<\/tr>\n<tr>\n<td>http::empty_body<\/td>\n<td>\u65e0\u5b58\u50a8<\/td>\n<td>GET \u8bf7\u6c42&#xff08;\u6ca1\u6709 body&#xff09;<\/td>\n<\/tr>\n<tr>\n<td>http::file_body<\/td>\n<td>\u6587\u4ef6\u63cf\u8ff0\u7b26<\/td>\n<td>\u5927\u6587\u4ef6\u4e0a\u4f20<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>**\u672c\u670d\u52a1\u5668\u4f7f\u7528 **http::dynamic_body&#xff1a;<\/p>\n<p>http<span class=\"token double-colon punctuation\">::<\/span>request<span class=\"token operator\">&lt;<\/span>http<span class=\"token double-colon punctuation\">::<\/span>dynamic_body<span class=\"token operator\">&gt;<\/span> request<span class=\"token punctuation\">;<\/span><\/p>\n<h5>request \u6838\u5fc3\u65b9\u6cd5\u4e00\u89c8<\/h5>\n<p><span class=\"token comment\">\/\/ \u2500\u2500 \u8bf7\u6c42\u884c \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500<\/span><br \/>\nhttp<span class=\"token double-colon punctuation\">::<\/span>verb   <span class=\"token function\">method<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">const<\/span><span class=\"token punctuation\">;<\/span>          <span class=\"token comment\">\/\/ \u8fd4\u56de\u679a\u4e3e&#xff1a;verb::get, verb::post, verb::put&#8230;<\/span><br \/>\nstring_view  <span class=\"token function\">method_string<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">const<\/span><span class=\"token punctuation\">;<\/span>   <span class=\"token comment\">\/\/ \u8fd4\u56de\u539f\u59cb\u5b57\u7b26\u4e32&#xff1a;&#034;GET&#034;, &#034;POST&#034;&#8230;<\/span><br \/>\nstring_view  <span class=\"token function\">target<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">const<\/span><span class=\"token punctuation\">;<\/span>          <span class=\"token comment\">\/\/ URL \u8def\u5f84\u90e8\u5206&#xff1a;&#034;\/count&#034;, &#034;\/time&#034;, &#034;\/email&#034;<\/span><br \/>\n<span class=\"token keyword\">unsigned<\/span>     <span class=\"token function\">version<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">const<\/span><span class=\"token punctuation\">;<\/span>         <span class=\"token comment\">\/\/ HTTP \u7248\u672c&#xff1a;10 (1.0), 11 (1.1)<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u2500\u2500 \u5934\u90e8\u64cd\u4f5c \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500<\/span><br \/>\n<span class=\"token keyword\">void<\/span> <span class=\"token function\">set<\/span><span class=\"token punctuation\">(<\/span>http<span class=\"token double-colon punctuation\">::<\/span>field name<span class=\"token punctuation\">,<\/span> string_view value<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u8bbe\u7f6e\u6807\u51c6\u5934\u90e8<\/span><br \/>\n<span class=\"token keyword\">void<\/span> <span class=\"token function\">set<\/span><span class=\"token punctuation\">(<\/span>string_view name<span class=\"token punctuation\">,<\/span> string_view value<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u8bbe\u7f6e\u81ea\u5b9a\u4e49\u5934\u90e8<\/span><br \/>\nstring_view <span class=\"token keyword\">operator<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">(<\/span>http<span class=\"token double-colon punctuation\">::<\/span>field name<span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">const<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u8bfb\u53d6\u5934\u90e8\u503c<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u2500\u2500 Body \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500<\/span><br \/>\nBody<span class=\"token operator\">&amp;<\/span>       <span class=\"token function\">body<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>                   <span class=\"token comment\">\/\/ \u53ef\u5199\u8bbf\u95ee body&#xff08;\u5982 dynamic_body&#xff09;<\/span><br \/>\n<span class=\"token keyword\">const<\/span> Body<span class=\"token operator\">&amp;<\/span> <span class=\"token function\">body<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">const<\/span><span class=\"token punctuation\">;<\/span>             <span class=\"token comment\">\/\/ \u53ea\u8bfb\u8bbf\u95ee<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u2500\u2500 \u57fa\u7c7b\u8bbf\u95ee \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500<\/span><br \/>\nheader<span class=\"token operator\">&lt;<\/span><span class=\"token boolean\">true<\/span><span class=\"token punctuation\">,<\/span> fields<span class=\"token operator\">&gt;<\/span><span class=\"token operator\">&amp;<\/span> <span class=\"token function\">base<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>         <span class=\"token comment\">\/\/ \u76f4\u63a5\u64cd\u4f5c header \u5c42<\/span><br \/>\n<span class=\"token keyword\">bool<\/span> <span class=\"token function\">keep_alive<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">const<\/span><span class=\"token punctuation\">;<\/span>              <span class=\"token comment\">\/\/ \u662f\u5426\u8bf7\u6c42\u4fdd\u6301\u8fde\u63a5<\/span><\/p>\n<h5>http::verb \u679a\u4e3e&#xff08;\u5e38\u7528\u503c&#xff09;<\/h5>\n<p><span class=\"token keyword\">enum<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">verb<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    delete_<span class=\"token punctuation\">,<\/span>  <span class=\"token comment\">\/\/ &#034;DELETE&#034;&#xff08;delete \u662f C&#043;&#043; \u5173\u952e\u5b57\u6240\u4ee5\u52a0\u4e0b\u5212\u7ebf&#xff09;<\/span><br \/>\n    get<span class=\"token punctuation\">,<\/span>      <span class=\"token comment\">\/\/ &#034;GET&#034;<\/span><br \/>\n    head<span class=\"token punctuation\">,<\/span>     <span class=\"token comment\">\/\/ &#034;HEAD&#034;<\/span><br \/>\n    post<span class=\"token punctuation\">,<\/span>     <span class=\"token comment\">\/\/ &#034;POST&#034;<\/span><br \/>\n    put<span class=\"token punctuation\">,<\/span>      <span class=\"token comment\">\/\/ &#034;PUT&#034;<\/span><br \/>\n    options<span class=\"token punctuation\">,<\/span>  <span class=\"token comment\">\/\/ &#034;OPTIONS&#034;<\/span><br \/>\n    patch<span class=\"token punctuation\">,<\/span>    <span class=\"token comment\">\/\/ &#034;PATCH&#034;<\/span><br \/>\n    <span class=\"token comment\">\/\/ &#8230; \u5171 30&#043; \u79cd<\/span><br \/>\n    unknown   <span class=\"token comment\">\/\/ \u65e0\u6cd5\u8bc6\u522b\u7684\u52a8\u8bcd<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<h5>http::field \u679a\u4e3e&#xff08;\u6807\u51c6 HTTP \u5934\u90e8\u540d&#xff09;<\/h5>\n<p><span class=\"token keyword\">enum<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">field<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    server<span class=\"token punctuation\">,<\/span>           <span class=\"token comment\">\/\/ &#034;Server&#034;<\/span><br \/>\n    content_type<span class=\"token punctuation\">,<\/span>     <span class=\"token comment\">\/\/ &#034;Content-Type&#034;<\/span><br \/>\n    content_length<span class=\"token punctuation\">,<\/span>   <span class=\"token comment\">\/\/ &#034;Content-Length&#034;<\/span><br \/>\n    accept<span class=\"token punctuation\">,<\/span>           <span class=\"token comment\">\/\/ &#034;Accept&#034;<\/span><br \/>\n    host<span class=\"token punctuation\">,<\/span>             <span class=\"token comment\">\/\/ &#034;Host&#034;<\/span><br \/>\n    user_agent<span class=\"token punctuation\">,<\/span>       <span class=\"token comment\">\/\/ &#034;User-Agent&#034;<\/span><br \/>\n    connection<span class=\"token punctuation\">,<\/span>       <span class=\"token comment\">\/\/ &#034;Connection&#034;<\/span><br \/>\n    <span class=\"token comment\">\/\/ &#8230; \u5171 50&#043; \u6807\u51c6\u5934\u90e8<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u4f7f\u7528 request.set(http::field::server, &#034;Beast&#034;) \u7b49\u4ef7\u4e8e\u8bbe\u7f6e\u5934\u90e8 Server: Beast\u3002<\/p>\n<h5>http::status \u679a\u4e3e&#xff08;HTTP \u72b6\u6001\u7801&#xff09;<\/h5>\n<p><span class=\"token keyword\">enum<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">status<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    ok                    <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">200<\/span><span class=\"token punctuation\">,<\/span><br \/>\n    bad_request           <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">400<\/span><span class=\"token punctuation\">,<\/span><br \/>\n    not_found             <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">404<\/span><span class=\"token punctuation\">,<\/span><br \/>\n    internal_server_error <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">500<\/span><span class=\"token punctuation\">,<\/span><br \/>\n    <span class=\"token comment\">\/\/ &#8230; \u5b8c\u6574\u72b6\u6001\u7801<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<h4>http::response&lt;Body&gt; \u2014 HTTP \u54cd\u5e94<\/h4>\n<p><span class=\"token keyword\">template<\/span><span class=\"token operator\">&lt;<\/span><span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Body<\/span><span class=\"token operator\">&gt;<\/span><br \/>\n<span class=\"token keyword\">class<\/span> <span class=\"token class-name\">response<\/span> <span class=\"token operator\">:<\/span> <span class=\"token base-clause\"><span class=\"token keyword\">public<\/span> <span class=\"token class-name\">header<\/span><span class=\"token operator\">&lt;<\/span><span class=\"token class-name\">false<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">fields<\/span><span class=\"token operator\">&gt;<\/span><\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u6ce8\u610f&#xff1a;\u7b2c\u4e8c\u4e2a\u6a21\u677f\u53c2\u6570\u662f false&#xff08;\u54cd\u5e94&#xff09;&#xff0c;request \u662f true&#xff08;\u8bf7\u6c42&#xff09;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<h5>response \u6838\u5fc3\u65b9\u6cd5<\/h5>\n<p><span class=\"token comment\">\/\/ \u2500\u2500 \u72b6\u6001\u884c \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500<\/span><br \/>\n<span class=\"token keyword\">void<\/span> <span class=\"token function\">result<\/span><span class=\"token punctuation\">(<\/span>http<span class=\"token double-colon punctuation\">::<\/span>status code<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>     <span class=\"token comment\">\/\/ \u8bbe\u7f6e\u72b6\u6001\u7801&#xff1a;response.result(http::status::ok);<\/span><br \/>\n<span class=\"token keyword\">void<\/span> <span class=\"token function\">version<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">unsigned<\/span> v<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>           <span class=\"token comment\">\/\/ \u8bbe\u7f6e HTTP \u7248\u672c&#xff08;\u901a\u5e38\u4ece request \u7ee7\u627f&#xff09;<\/span><br \/>\n<span class=\"token keyword\">void<\/span> <span class=\"token function\">keep_alive<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">bool<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>              <span class=\"token comment\">\/\/ \u8bbe\u7f6e\u662f\u5426\u4fdd\u6301\u8fde\u63a5<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u2500\u2500 \u5934\u90e8 \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500<\/span><br \/>\n<span class=\"token keyword\">void<\/span> <span class=\"token function\">set<\/span><span class=\"token punctuation\">(<\/span>http<span class=\"token double-colon punctuation\">::<\/span>field name<span class=\"token punctuation\">,<\/span> string_view value<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u540c request<\/span><br \/>\n<span class=\"token keyword\">void<\/span> <span class=\"token function\">content_length<\/span><span class=\"token punctuation\">(<\/span>std<span class=\"token double-colon punctuation\">::<\/span>size_t n<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>             <span class=\"token comment\">\/\/ \u5feb\u6377\u8bbe\u7f6e Content-Length<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u2500\u2500 Body \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500<\/span><br \/>\nBody<span class=\"token operator\">&amp;<\/span> <span class=\"token function\">body<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>                       <span class=\"token comment\">\/\/ \u83b7\u53d6 body \u5f15\u7528&#xff0c;\u7528\u4e8e\u5199\u5165\u54cd\u5e94\u4f53<\/span><\/p>\n<h5>\u8bbe\u7f6e Content-Length \u7684\u4e24\u79cd\u65b9\u5f0f<\/h5>\n<p><span class=\"token comment\">\/\/ \u65b9\u5f0f\u4e00&#xff1a;\u624b\u52a8\u8bbe\u7f6e<\/span><br \/>\nresponse<span class=\"token punctuation\">.<\/span><span class=\"token function\">set<\/span><span class=\"token punctuation\">(<\/span>http<span class=\"token double-colon punctuation\">::<\/span>field<span class=\"token double-colon punctuation\">::<\/span>content_length<span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;1234&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u65b9\u5f0f\u4e8c&#xff1a;\u4f7f\u7528\u4fbf\u6377\u65b9\u6cd5&#xff08;\u63a8\u8350&#xff09;<\/span><br \/>\nresponse<span class=\"token punctuation\">.<\/span><span class=\"token function\">content_length<\/span><span class=\"token punctuation\">(<\/span>response<span class=\"token punctuation\">.<\/span><span class=\"token function\">body<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">size<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<h4>http::dynamic_body \u2014 \u52a8\u6001\u6d88\u606f\u4f53<\/h4>\n<p><span class=\"token keyword\">namespace<\/span> boost<span class=\"token double-colon punctuation\">::<\/span>beast<span class=\"token double-colon punctuation\">::<\/span>http <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">using<\/span> dynamic_body <span class=\"token operator\">&#061;<\/span> basic_dynamic_body<span class=\"token operator\">&lt;<\/span>basic_multi_buffer<span class=\"token operator\">&lt;<\/span>std<span class=\"token double-colon punctuation\">::<\/span>allocator<span class=\"token operator\">&lt;<\/span><span class=\"token keyword\">char<\/span><span class=\"token operator\">&gt;&gt;<\/span><span class=\"token operator\">&gt;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u6838\u5fc3\u7279\u6027&#xff1a;<\/p>\n<ul>\n<li>\u5185\u90e8\u4f7f\u7528\u94fe\u5f0f\u7f13\u51b2\u533a (basic_multi_buffer)&#xff0c;\u6570\u636e\u5206\u6563\u5728\u591a\u4e2a\u5185\u5b58\u5757\u4e2d<\/li>\n<li>\u652f\u6301\u8ffd\u52a0\u5199\u5165&#xff0c;\u81ea\u52a8\u6269\u5c55<\/li>\n<li>\u4e0d\u9002\u5408\u8fde\u7eed\u5185\u5b58\u8bbf\u95ee&#xff0c;\u9700\u7528 buffers_to_string() \u6216 beast::ostream \u64cd\u4f5c<\/li>\n<\/ul>\n<p>\u5173\u952e\u65b9\u6cd5&#xff1a;<\/p>\n<p><span class=\"token comment\">\/\/ \u83b7\u53d6\u5e95\u5c42\u7f13\u51b2\u533a\u5e8f\u5217&#xff08;ConstBufferSequence&#xff09;<\/span><br \/>\n<span class=\"token keyword\">auto<\/span> <span class=\"token function\">data<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">const<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u8fd4\u56de\u53ef\u7528\u4e8e buffers_to_string \u7684\u7f13\u51b2\u533a\u89c6\u56fe<\/span><br \/>\n<span class=\"token keyword\">auto<\/span> <span class=\"token function\">size<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">const<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ body \u603b\u5b57\u8282\u6570<\/span><br \/>\n<span class=\"token keyword\">void<\/span> <span class=\"token function\">clear<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>       <span class=\"token comment\">\/\/ \u6e05\u7a7a body<\/span><\/p>\n<h4>beast::flat_buffer \u2014 \u8bfb\u5199\u7f13\u51b2\u533a<\/h4>\n<p>beast<span class=\"token double-colon punctuation\">::<\/span>flat_buffer buffer<span class=\"token punctuation\">{<\/span><span class=\"token number\">8192<\/span><span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u521d\u59cb 8KB&#xff0c;\u4e0d\u591f\u81ea\u52a8\u6269\u5bb9<\/span><\/p>\n<p>\u7279\u6027&#xff1a;<\/p>\n<ul>\n<li>\u5b9e\u73b0 DynamicBuffer concept&#xff0c;\u662f http::async_read \u7684\u5fc5\u9700\u53c2\u6570<\/li>\n<li>\u5185\u90e8\u662f\u4e00\u5757\u8fde\u7eed\u5185\u5b58&#xff08;\u4e0e multi_buffer \u4e0d\u540c&#xff09;<\/li>\n<li>\u81ea\u52a8\u7ba1\u7406\u8bfb\u5199\u4f4d\u7f6e&#xff1a;data() \u8fd4\u56de\u5df2\u8bfb\u5165\u672a\u6d88\u8d39\u533a&#xff0c;prepare() \u5206\u914d\u5199\u5165\u7a7a\u95f4&#xff0c;commit() \u6807\u8bb0\u5199\u5165\u5b8c\u6210<\/li>\n<\/ul>\n<p>\u5728\u4f60\u81ea\u5df1\u7684\u5b9e\u73b0\u4e2d\u53ea\u9700\u77e5\u9053&#xff1a;async_read** \u5c06\u7f51\u7edc\u6570\u636e\u8bfb\u53d6\u5230\u6b64\u7f13\u51b2\u533a&#xff0c;\u540c\u65f6\u4ece\u4e2d\u89e3\u6790 HTTP \u6d88\u606f**\u3002<\/p>\n<h4>beast::ostream \u2014 \u6d41\u5f0f\u5199\u5165 Body<\/h4>\n<p><span class=\"token comment\">\/\/ beast::ostream \u5305\u88c5\u4e00\u4e2a dynamic_body&#xff0c;\u63d0\u4f9b operator&lt;&lt;<\/span><br \/>\nbeast<span class=\"token double-colon punctuation\">::<\/span><span class=\"token function\">ostream<\/span><span class=\"token punctuation\">(<\/span>response<span class=\"token punctuation\">.<\/span><span class=\"token function\">body<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;&lt;html&gt;\\\\n&#034;<\/span><br \/>\n    <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;&lt;head&gt;&lt;title&gt;Request count&lt;\/title&gt;&lt;\/head&gt;\\\\n&#034;<\/span><br \/>\n    <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;&lt;body&gt;\\\\n&#034;<\/span><br \/>\n    <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;&lt;h1&gt;Request count&lt;\/h1&gt;\\\\n&#034;<\/span><br \/>\n    <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;&lt;\/body&gt;\\\\n&#034;<\/span><br \/>\n    <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;&lt;\/html&gt;\\\\n&#034;<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u7b49\u4ef7\u4e8e&#xff1a;\u628a\u4e00\u4e2a dynamic_body \u5f53\u4f5c std::ostream \u6765\u7528&#xff0c;\u652f\u6301\u8fde\u7eed &lt;&lt; \u62fc\u63a5\u5b57\u7b26\u4e32\u3002\u6bcf\u6b21 &lt;&lt; \u90fd\u4f1a\u5411 body \u5185\u90e8\u7f13\u51b2\u533a\u8ffd\u52a0\u6570\u636e\u3002<\/p>\n<h4>beast::buffers_to_string \u2014 \u7f13\u51b2\u533a\u2192\u5b57\u7b26\u4e32<\/h4>\n<p><span class=\"token keyword\">template<\/span><span class=\"token operator\">&lt;<\/span><span class=\"token keyword\">class<\/span> <span class=\"token class-name\">ConstBufferSequence<\/span><span class=\"token operator\">&gt;<\/span><br \/>\nstd<span class=\"token double-colon punctuation\">::<\/span>string <span class=\"token function\">buffers_to_string<\/span><span class=\"token punctuation\">(<\/span>ConstBufferSequence <span class=\"token keyword\">const<\/span><span class=\"token operator\">&amp;<\/span> buffers<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u5c06\u7f13\u51b2\u533a\u5e8f\u5217\u62fc\u63a5\u6210\u5355\u4e2a std::string\u3002\u5178\u578b\u7528\u6cd5&#xff1a;<\/p>\n<p><span class=\"token keyword\">auto<\/span><span class=\"token operator\">&amp;<\/span> body <span class=\"token operator\">&#061;<\/span> request<span class=\"token punctuation\">.<\/span><span class=\"token function\">body<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">auto<\/span> body_str <span class=\"token operator\">&#061;<\/span> boost<span class=\"token double-colon punctuation\">::<\/span>beast<span class=\"token double-colon punctuation\">::<\/span><span class=\"token function\">buffers_to_string<\/span><span class=\"token punctuation\">(<\/span>body<span class=\"token punctuation\">.<\/span><span class=\"token function\">data<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token comment\">\/\/ body_str \u73b0\u5728\u662f\u5b8c\u6574\u7684\u8bf7\u6c42\u4f53\u5b57\u7b26\u4e32&#xff0c;\u53ef\u4f20\u7ed9 JSON \u89e3\u6790\u5668<\/span><\/p>\n<p>\u4e3a\u4ec0\u4e48\u9700\u8981\u8fd9\u4e2a\u51fd\u6570&#xff1a; dynamic_body.data() \u8fd4\u56de\u7684\u662f ConstBufferSequence&#xff08;\u53ef\u80fd\u662f\u591a\u4e2a\u4e0d\u8fde\u7eed\u5185\u5b58\u5757\u7684\u89c6\u56fe&#xff09;&#xff0c;\u4e0d\u80fd\u76f4\u63a5\u5f53\u5b57\u7b26\u4e32\u7528\u3002buffers_to_string \u8d1f\u8d23\u5c06\u5b83\u4eec\u62fc\u63a5\u3002<\/p>\n<h4>beast::error_code \u2014 \u9519\u8bef\u7801<\/h4>\n<p><span class=\"token comment\">\/\/ beast::error_code \u672c\u8d28\u4e0a\u662f boost::system::error_code \u7684\u522b\u540d<\/span><br \/>\n<span class=\"token keyword\">namespace<\/span> beast <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">using<\/span> error_code <span class=\"token operator\">&#061;<\/span> boost<span class=\"token double-colon punctuation\">::<\/span>system<span class=\"token double-colon punctuation\">::<\/span>error_code<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u672c\u670d\u52a1\u5668\u4e2d\u7684\u7528\u6cd5&#xff1a;<\/p>\n<p>beast<span class=\"token double-colon punctuation\">::<\/span>error_code ec<span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ redirect_error \u8ba9 co_await \u4e0d\u629b\u5f02\u5e38&#xff0c;\u800c\u662f\u628a\u9519\u8bef\u5199\u5165 ec<\/span><br \/>\n<span class=\"token keyword\">co_await<\/span> <span class=\"token function\">some_async_op<\/span><span class=\"token punctuation\">(<\/span>net<span class=\"token double-colon punctuation\">::<\/span><span class=\"token function\">redirect_error<\/span><span class=\"token punctuation\">(<\/span>use_awaitable<span class=\"token punctuation\">,<\/span> ec<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>ec<span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token keyword\">co_return<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u6709\u9519\u8bef\u5c31\u9000\u51fa<\/span><\/p>\n<h4>http::async_read \u2014 \u5f02\u6b65\u8bfb\u53d6\u5b8c\u6574 HTTP \u8bf7\u6c42<\/h4>\n<p><span class=\"token keyword\">template<\/span><span class=\"token operator\">&lt;<\/span><br \/>\n    <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">SyncReadStream<\/span><span class=\"token punctuation\">,<\/span>   <span class=\"token comment\">\/\/ \u5982 tcp::socket<\/span><br \/>\n    <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">DynamicBuffer<\/span><span class=\"token punctuation\">,<\/span>    <span class=\"token comment\">\/\/ \u5982 flat_buffer<\/span><br \/>\n    <span class=\"token keyword\">bool<\/span> isRequest<span class=\"token punctuation\">,<\/span>         <span class=\"token comment\">\/\/ true&#061;\u8bf7\u6c42, false&#061;\u54cd\u5e94&#xff08;\u7531\u53c2\u6570\u63a8\u5bfc&#xff09;<\/span><br \/>\n    <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Body<\/span><span class=\"token punctuation\">,<\/span><br \/>\n    <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Fields<\/span><span class=\"token punctuation\">,<\/span><br \/>\n    <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">CompletionToken<\/span>   <span class=\"token comment\">\/\/ use_awaitable \u6216\u56de\u8c03<\/span><br \/>\n<span class=\"token operator\">&gt;<\/span><br \/>\n<span class=\"token keyword\">auto<\/span> <span class=\"token function\">async_read<\/span><span class=\"token punctuation\">(<\/span><br \/>\n    SyncReadStream<span class=\"token operator\">&amp;<\/span>     stream<span class=\"token punctuation\">,<\/span><br \/>\n    DynamicBuffer<span class=\"token operator\">&amp;<\/span>      buffer<span class=\"token punctuation\">,<\/span><br \/>\n    http<span class=\"token double-colon punctuation\">::<\/span>message<span class=\"token operator\">&lt;<\/span>isRequest<span class=\"token punctuation\">,<\/span> Body<span class=\"token punctuation\">,<\/span> Fields<span class=\"token operator\">&gt;<\/span><span class=\"token operator\">&amp;<\/span> msg<span class=\"token punctuation\">,<\/span>  <span class=\"token comment\">\/\/ request \u6216 response<\/span><br \/>\n    CompletionToken<span class=\"token operator\">&amp;&amp;<\/span>   token<br \/>\n<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u5b9e\u9645\u8c03\u7528&#xff1a;<\/p>\n<p>nbytes <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">co_await<\/span> http<span class=\"token double-colon punctuation\">::<\/span><span class=\"token function\">async_read<\/span><span class=\"token punctuation\">(<\/span><br \/>\n    socket<span class=\"token punctuation\">,<\/span>                                  <span class=\"token comment\">\/\/ tcp::socket&amp;<\/span><br \/>\n    buffer<span class=\"token punctuation\">,<\/span>                                  <span class=\"token comment\">\/\/ flat_buffer&amp;<\/span><br \/>\n    request<span class=\"token punctuation\">,<\/span>                                 <span class=\"token comment\">\/\/ http::request&lt;dynamic_body&gt;&amp;<\/span><br \/>\n    net<span class=\"token double-colon punctuation\">::<\/span><span class=\"token function\">redirect_error<\/span><span class=\"token punctuation\">(<\/span>use_awaitable<span class=\"token punctuation\">,<\/span> ec<span class=\"token punctuation\">)<\/span>   <span class=\"token comment\">\/\/ \u9519\u8bef\u91cd\u5b9a\u5411<\/span><br \/>\n<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>async_read** \u5185\u90e8\u505a\u4e86\u56db\u4ef6\u4e8b&#xff1a;**<\/p>\n<p>\u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510<br \/>\n\u2502                  http::async_read                     \u2502<br \/>\n\u2502                                                      \u2502<br \/>\n\u2502  \u7b2c 1 \u6b65&#xff1a;\u4ece socket \u8bfb\u53d6\u539f\u59cb\u5b57\u8282\u5230 buffer             \u2502<br \/>\n\u2502          GET \/count HTTP\/1.1\\\\r\\\\n                     \u2502<br \/>\n\u2502          Host: localhost\\\\r\\\\n                         \u2502<br \/>\n\u2502          \\\\r\\\\n                                        \u2502<br \/>\n\u2502                                                      \u2502<br \/>\n\u2502  \u7b2c 2 \u6b65&#xff1a;\u89e3\u6790\u8bf7\u6c42\u884c                                  \u2502<br \/>\n\u2502          &#034;GET&#034;  \u2192 method_ &#061; http::verb::get          \u2502<br \/>\n\u2502          &#034;\/count&#034; \u2192 target_ &#061; &#034;\/count&#034;                \u2502<br \/>\n\u2502          &#034;HTTP\/1.1&#034; \u2192 version_ &#061; 11                  \u2502<br \/>\n\u2502                                                      \u2502<br \/>\n\u2502  \u7b2c 3 \u6b65&#xff1a;\u89e3\u6790\u6240\u6709\u5934\u90e8\u76f4\u5230\u7a7a\u884c                         \u2502<br \/>\n\u2502          &#034;Host: localhost&#034; \u2192 fields[&#034;Host&#034;]           \u2502<br \/>\n\u2502                                                      \u2502<br \/>\n\u2502  \u7b2c 4 \u6b65&#xff1a;\u6839\u636e Content-Length \u6216                      \u2502<br \/>\n\u2502          Transfer-Encoding: chunked \u8bfb\u53d6\u5b8c\u6574 body     \u2502<br \/>\n\u2502          &#xff08;\u5982\u65e0 body \u5219\u8df3\u8fc7&#xff09;                          \u2502<br \/>\n\u2502                                                      \u2502<br \/>\n\u2502  \u7ed3\u679c&#xff1a;request \u5bf9\u8c61\u5b8c\u6574\u586b\u5145                           \u2502<br \/>\n\u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518<\/p>\n<p>\u8fd4\u56de\u503c&#xff1a; co_await \u8fd4\u56de\u5b9e\u9645\u4f20\u8f93\u7684\u603b\u5b57\u8282\u6570&#xff08;\u5305\u62ec\u5934\u90e8 &#043; body&#xff09;\u3002<\/p>\n<h4>http::async_write \u2014 \u5f02\u6b65\u53d1\u9001 HTTP \u54cd\u5e94<\/h4>\n<p><span class=\"token keyword\">template<\/span><span class=\"token operator\">&lt;<\/span><br \/>\n    <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">SyncWriteStream<\/span><span class=\"token punctuation\">,<\/span>  <span class=\"token comment\">\/\/ \u5982 tcp::socket<\/span><br \/>\n    <span class=\"token keyword\">bool<\/span> isRequest<span class=\"token punctuation\">,<\/span><br \/>\n    <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Body<\/span><span class=\"token punctuation\">,<\/span><br \/>\n    <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Fields<\/span><span class=\"token punctuation\">,<\/span><br \/>\n    <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">CompletionToken<\/span><br \/>\n<span class=\"token operator\">&gt;<\/span><br \/>\n<span class=\"token keyword\">auto<\/span> <span class=\"token function\">async_write<\/span><span class=\"token punctuation\">(<\/span><br \/>\n    SyncWriteStream<span class=\"token operator\">&amp;<\/span>                            stream<span class=\"token punctuation\">,<\/span><br \/>\n    http<span class=\"token double-colon punctuation\">::<\/span>message<span class=\"token operator\">&lt;<\/span>isRequest<span class=\"token punctuation\">,<\/span> Body<span class=\"token punctuation\">,<\/span> Fields<span class=\"token operator\">&gt;<\/span><span class=\"token operator\">&amp;<\/span>     msg<span class=\"token punctuation\">,<\/span>    <span class=\"token comment\">\/\/ request \u6216 response<\/span><br \/>\n    CompletionToken<span class=\"token operator\">&amp;&amp;<\/span>                           token<br \/>\n<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u5b9e\u9645\u8c03\u7528&#xff1a;<\/p>\n<p>nbytes <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">co_await<\/span> http<span class=\"token double-colon punctuation\">::<\/span><span class=\"token function\">async_write<\/span><span class=\"token punctuation\">(<\/span><br \/>\n    socket<span class=\"token punctuation\">,<\/span><br \/>\n    response<span class=\"token punctuation\">,<\/span><br \/>\n    net<span class=\"token double-colon punctuation\">::<\/span><span class=\"token function\">redirect_error<\/span><span class=\"token punctuation\">(<\/span>use_awaitable<span class=\"token punctuation\">,<\/span> ec<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>async_write** \u5185\u90e8\u505a\u4e86\u4e24\u4ef6\u4e8b&#xff1a;**<\/p>\n<li>\u5e8f\u5217\u5316&#xff1a;\u5c06 response \u5bf9\u8c61\u8f6c\u6362\u4e3a HTTP\/1.1 \u7ebf\u683c\u5f0f<\/li>\n<li>\u53d1\u9001&#xff1a;\u901a\u8fc7 socket \u5c06\u5e8f\u5217\u5316\u540e\u7684\u6570\u636e\u5199\u5165\u7f51\u7edc<\/li>\n<p>\u6ce8\u610f&#xff1a; async_write \u4e0d\u9700\u8981 DynamicBuffer \u53c2\u6570&#xff0c;\u56e0\u4e3a\u5e8f\u5217\u5316\u662f\u76f4\u63a5\u4ece message \u5bf9\u8c61\u5185\u90e8\u6570\u636e\u751f\u6210\u7684&#xff0c;\u4e0d\u9700\u8981\u5916\u90e8\u7f13\u51b2\u3002<\/p>\n<h4>http::request \/ http::response \u7684\u7ee7\u627f\u5173\u7cfb<\/h4>\n<p>message&lt;isRequest, Body, Fields&gt;<br \/>\n  \u2502<br \/>\n  \u251c\u2500\u2500 header&lt;isRequest, Fields&gt;<br \/>\n  \u2502     \u2502<br \/>\n  \u2502     \u251c\u2500\u2500 fields  (\u5934\u90e8\u952e\u503c\u5bf9)<br \/>\n  \u2502     \u251c\u2500\u2500 method() \/ method_string()   [\u4ec5 isRequest&#061;true]<br \/>\n  \u2502     \u251c\u2500\u2500 target()                     [\u4ec5 isRequest&#061;true]<br \/>\n  \u2502     \u251c\u2500\u2500 result()                     [\u4ec5 isRequest&#061;false]<br \/>\n  \u2502     \u251c\u2500\u2500 version()<br \/>\n  \u2502     \u251c\u2500\u2500 set(field, value)<br \/>\n  \u2502     \u251c\u2500\u2500 operator[](field)<br \/>\n  \u2502     \u2514\u2500\u2500 keep_alive()<br \/>\n  \u2502<br \/>\n  \u2514\u2500\u2500 Body body_  (\u6d88\u606f\u4f53)<br \/>\n        \u251c\u2500\u2500 body()       \u2014 \u83b7\u53d6 Body \u5f15\u7528<br \/>\n        \u2514\u2500\u2500 body().data() \/ body().size()<\/p>\n<p>\u5173\u952e\u7406\u89e3&#xff1a; request &#061; message&lt;true, Body, Fields&gt;&#xff0c;response &#061; message&lt;false, Body, Fields&gt;\u3002\u533a\u522b\u5728\u4e8e\u8bf7\u6c42\u6709 method()\/target()&#xff0c;\u54cd\u5e94\u6709 result()\u3002<\/p>\n<hr \/>\n<h3>HTTP \u8bf7\u6c42\u89e3\u6790\u5168\u6d41\u7a0b<\/h3>\n<p>\u4ee5\u5ba2\u6237\u7aef\u53d1\u9001\u4ee5\u4e0b\u8bf7\u6c42\u4e3a\u4f8b&#xff1a;<\/p>\n<p>POST \/email HTTP\/1.1<br \/>\nHost: localhost:10086<br \/>\nContent-Type: application\/json<br \/>\nContent-Length: 45<\/p>\n<p>{&#034;email&#034;:&#034;hello&#064;example.com&#034;,&#034;msg&#034;:&#034;hi&#034;}<\/p>\n<h4>\u6b65\u9aa4 1&#xff1a;\u539f\u59cb\u5b57\u8282\u5230\u8fbe<\/h4>\n<p>TCP \u8fde\u63a5\u4e0a\u6536\u5230\u5b57\u8282\u6d41&#xff1a;<br \/>\n50 4F 53 54 20 2F 65 6D 61 69 6C 20 48 54 54 50  \u2192 &#034;POST \/email HTTP&#034;<br \/>\n2F 31 2E 31 0D 0A 48 6F 73 74 3A 20 6C 6F 63 61  \u2192 &#034;\/1.1\\\\r\\\\nHost: loca&#034;<br \/>\n&#8230;<\/p>\n<h4>\u6b65\u9aa4 2&#xff1a;http::async_read \u8bfb\u53d6\u5230 flat_buffer<\/h4>\n<h4>\u6b65\u9aa4 3&#xff1a;Beast \u5185\u90e8\u89e3\u6790\u5668\u5de5\u4f5c<\/h4>\n<p>\u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510<br \/>\n\u2502  Beast \u5185\u90e8 basic_parser&lt;isRequest, Body&gt;            \u2502<br \/>\n\u2502                                                      \u2502<br \/>\n\u2502  \u9636\u6bb5 \u2460 \u89e3\u6790\u8bf7\u6c42\u884c&#xff1a;                                  \u2502<br \/>\n\u2502  &#034;POST \/email HTTP\/1.1\\\\r\\\\n&#034;                          \u2502<br \/>\n\u2502    \u2502      \u2502        \u2502                                 \u2502<br \/>\n\u2502    \u2502      \u2502        \u2514\u2192 version_ &#061; 11 (HTTP\/1.1)       \u2502<br \/>\n\u2502    \u2502      \u2514\u2192 target_ &#061; &#034;\/email&#034;                      \u2502<br \/>\n\u2502    \u2514\u2192 method_ &#061; http::verb::post                     \u2502<br \/>\n\u2502                                                      \u2502<br \/>\n\u2502  \u9636\u6bb5 \u2461 \u9010\u884c\u89e3\u6790\u5934\u90e8\u76f4\u5230 \\\\r\\\\n&#xff1a;                       \u2502<br \/>\n\u2502  &#034;Host: localhost:10086\\\\r\\\\n&#034;                         \u2502<br \/>\n\u2502  &#034;Content-Type: application\/json\\\\r\\\\n&#034;                \u2502<br \/>\n\u2502  &#034;Content-Length: 45\\\\r\\\\n&#034;                            \u2502<br \/>\n\u2502  &#034;\\\\r\\\\n&#034;  \u2190 \u7a7a\u884c\u6807\u5fd7\u5934\u90e8\u7ed3\u675f                           \u2502<br \/>\n\u2502                                                      \u2502<br \/>\n\u2502  \u9636\u6bb5 \u2462 \u8bfb\u53d6 body&#xff1a;                                   \u2502<br \/>\n\u2502  Content-Length&#061;45 \u2192 \u7cbe\u786e\u8bfb\u53d6 45 \u5b57\u8282                  \u2502<br \/>\n\u2502  \u2192 body_ \u5305\u542b {&#034;email&#034;:&#034;hello&#064;example.com&#034;,&#034;msg&#034;:&#034;hi&#034;}\u2502<br \/>\n\u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518<\/p>\n<h4>\u6b65\u9aa4 4&#xff1a;\u89e3\u6790\u5b8c\u6210&#xff0c;request \u5bf9\u8c61\u53ef\u67e5\u8be2<\/h4>\n<p>request<span class=\"token punctuation\">.<\/span><span class=\"token function\">method<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span>      <span class=\"token comment\">\/\/ \u2192 http::verb::post<\/span><br \/>\nrequest<span class=\"token punctuation\">.<\/span><span class=\"token function\">method_string<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token comment\">\/\/ \u2192 &#034;POST&#034;<\/span><br \/>\nrequest<span class=\"token punctuation\">.<\/span><span class=\"token function\">target<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span>      <span class=\"token comment\">\/\/ \u2192 &#034;\/email&#034;<\/span><br \/>\nrequest<span class=\"token punctuation\">.<\/span><span class=\"token function\">version<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span>     <span class=\"token comment\">\/\/ \u2192 11<\/span><br \/>\nrequest<span class=\"token punctuation\">[<\/span><span class=\"token string\">&#034;Host&#034;<\/span><span class=\"token punctuation\">]<\/span>       <span class=\"token comment\">\/\/ \u2192 &#034;localhost:10086&#034;<\/span><br \/>\nrequest<span class=\"token punctuation\">[<\/span><span class=\"token string\">&#034;Content-Type&#034;<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token comment\">\/\/ \u2192 &#034;application\/json&#034;<\/span><br \/>\nrequest<span class=\"token punctuation\">.<\/span><span class=\"token function\">body<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">size<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token comment\">\/\/ \u2192 45<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u83b7\u53d6 body \u5b57\u7b26\u4e32&#xff1a;<\/span><br \/>\n<span class=\"token keyword\">auto<\/span><span class=\"token operator\">&amp;<\/span> body <span class=\"token operator\">&#061;<\/span> request<span class=\"token punctuation\">.<\/span><span class=\"token function\">body<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">auto<\/span> body_str <span class=\"token operator\">&#061;<\/span> boost<span class=\"token double-colon punctuation\">::<\/span>beast<span class=\"token double-colon punctuation\">::<\/span><span class=\"token function\">buffers_to_string<\/span><span class=\"token punctuation\">(<\/span>body<span class=\"token punctuation\">.<\/span><span class=\"token function\">data<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token comment\">\/\/ \u2192 {&#034;email&#034;:&#034;hello&#064;example.com&#034;,&#034;msg&#034;:&#034;hi&#034;}<\/span><\/p>\n<h4>Body \u8bfb\u53d6\u7684\u4e24\u79cd\u60c5\u51b5<\/h4>\n<p>Beast \u7684 async_read \u81ea\u52a8\u5904\u7406\u4e24\u79cd body \u4f20\u8f93\u6a21\u5f0f&#xff1a;<\/p>\n<table>\n<tr>\u4f20\u8f93\u6a21\u5f0f\u5934\u90e8\u6807\u5fd7\u8bfb\u53d6\u65b9\u5f0f<\/tr>\n<tbody>\n<tr>\n<td>Content-Length<\/td>\n<td>Content-Length: 1234<\/td>\n<td>\u7cbe\u786e\u8bfb\u53d6 1234 \u5b57\u8282<\/td>\n<\/tr>\n<tr>\n<td>\u5206\u5757\u4f20\u8f93<\/td>\n<td>Transfer-Encoding: chunked<\/td>\n<td>\u9010\u5757\u8bfb\u53d6\u76f4\u5230 0\\\\r\\\\n\\\\r\\\\n<\/td>\n<\/tr>\n<tr>\n<td>\u65e0 body<\/td>\n<td>\u4e24\u8005\u7686\u65e0<\/td>\n<td>\u4e0d\u8bfb\u4efb\u4f55 body \u6570\u636e<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u4f5c\u4e3a\u670d\u52a1\u5668\u5f00\u53d1\u8005&#xff0c;\u4f60\u65e0\u9700\u5173\u5fc3\u8fd9\u4e9b\u7ec6\u8282 \u2014 async_read \u5168\u90e8\u81ea\u52a8\u5904\u7406\u3002<\/p>\n<hr \/>\n<h3>HTTP \u54cd\u5e94\u6784\u9020\u4e0e\u53d1\u9001<\/h3>\n<h4>\u54cd\u5e94\u6784\u9020\u987a\u5e8f&#xff08;\u91cd\u8981&#xff01;&#xff09;<\/h4>\n<p><span class=\"token comment\">\/\/ \u2460 \u8bbe\u7f6e HTTP \u7248\u672c&#xff08;\u7ee7\u627f\u81ea\u8bf7\u6c42&#xff09;<\/span><br \/>\nresponse<span class=\"token punctuation\">.<\/span><span class=\"token function\">version<\/span><span class=\"token punctuation\">(<\/span>request<span class=\"token punctuation\">.<\/span><span class=\"token function\">version<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u2461 \u8bbe\u7f6e\u8fde\u63a5\u6a21\u5f0f<\/span><br \/>\nresponse<span class=\"token punctuation\">.<\/span><span class=\"token function\">keep_alive<\/span><span class=\"token punctuation\">(<\/span><span class=\"token boolean\">false<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u2462 \u8bbe\u7f6e\u72b6\u6001\u7801<\/span><br \/>\nresponse<span class=\"token punctuation\">.<\/span><span class=\"token function\">result<\/span><span class=\"token punctuation\">(<\/span>http<span class=\"token double-colon punctuation\">::<\/span>status<span class=\"token double-colon punctuation\">::<\/span>ok<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u2463 \u8bbe\u7f6e\u5934\u90e8<\/span><br \/>\nresponse<span class=\"token punctuation\">.<\/span><span class=\"token function\">set<\/span><span class=\"token punctuation\">(<\/span>http<span class=\"token double-colon punctuation\">::<\/span>field<span class=\"token double-colon punctuation\">::<\/span>server<span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;Beast&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\nresponse<span class=\"token punctuation\">.<\/span><span class=\"token function\">set<\/span><span class=\"token punctuation\">(<\/span>http<span class=\"token double-colon punctuation\">::<\/span>field<span class=\"token double-colon punctuation\">::<\/span>content_type<span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;text\/html&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u2464 \u5199\u5165\u54cd\u5e94\u4f53<\/span><br \/>\nbeast<span class=\"token double-colon punctuation\">::<\/span><span class=\"token function\">ostream<\/span><span class=\"token punctuation\">(<\/span>response<span class=\"token punctuation\">.<\/span><span class=\"token function\">body<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;Hello World&#034;<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u2465 \u26a0\ufe0f \u5fc5\u987b\u5728\u8c03\u7528 async_write \u4e4b\u524d\u8bbe\u7f6e Content-Length<\/span><br \/>\nresponse<span class=\"token punctuation\">.<\/span><span class=\"token function\">content_length<\/span><span class=\"token punctuation\">(<\/span>response<span class=\"token punctuation\">.<\/span><span class=\"token function\">body<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">size<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u2466 \u53d1\u9001<\/span><br \/>\n<span class=\"token keyword\">co_await<\/span> http<span class=\"token double-colon punctuation\">::<\/span><span class=\"token function\">async_write<\/span><span class=\"token punctuation\">(<\/span>socket<span class=\"token punctuation\">,<\/span> response<span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u5751\u70b9\u8b66\u544a&#xff1a; \u6b65\u9aa4 \u2465 \u5fc5\u987b\u5728\u6b65\u9aa4 \u2466 \u4e4b\u524d\u5b8c\u6210&#xff01;content_length() \u8bbe\u7f6e\u7684\u662f\u5e8f\u5217\u5316\u65f6\u8f93\u51fa\u7684 Content-Length \u5934\u90e8\u503c&#xff0c;\u5982\u679c body \u5728 content_length() \u4e4b\u540e\u53c8\u88ab\u4fee\u6539&#xff0c;\u53d1\u9001\u7684\u957f\u5ea6\u5c31\u4f1a\u4e0d\u5339\u914d\u3002<\/p>\n<h4>content_length() \u7684\u5de5\u4f5c\u539f\u7406<\/h4>\n<p><span class=\"token keyword\">void<\/span> <span class=\"token function\">content_length<\/span><span class=\"token punctuation\">(<\/span>std<span class=\"token double-colon punctuation\">::<\/span>size_t n<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u7b49\u4ef7\u4e8e&#xff1a;<\/span><br \/>\n    <span class=\"token keyword\">this<\/span><span class=\"token operator\">-&gt;<\/span><span class=\"token function\">set<\/span><span class=\"token punctuation\">(<\/span>http<span class=\"token double-colon punctuation\">::<\/span>field<span class=\"token double-colon punctuation\">::<\/span>content_length<span class=\"token punctuation\">,<\/span> std<span class=\"token double-colon punctuation\">::<\/span><span class=\"token function\">to_string<\/span><span class=\"token punctuation\">(<\/span>n<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u5b83\u53ea\u662f\u5e2e\u4f60\u8bbe\u7f6e Content-Length \u5934\u90e8\u3002\u5185\u90e8\u8c03\u7528 response.body().size() \u6765\u8ba1\u7b97\u3002<\/p>\n<h4>\u4e0d\u540c Content-Type \u7684\u54cd\u5e94\u6784\u9020<\/h4>\n<p><span class=\"token comment\">\/\/ \u2500\u2500 text\/html \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500<\/span><br \/>\nresponse<span class=\"token punctuation\">.<\/span><span class=\"token function\">set<\/span><span class=\"token punctuation\">(<\/span>http<span class=\"token double-colon punctuation\">::<\/span>field<span class=\"token double-colon punctuation\">::<\/span>content_type<span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;text\/html&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\nbeast<span class=\"token double-colon punctuation\">::<\/span><span class=\"token function\">ostream<\/span><span class=\"token punctuation\">(<\/span>response<span class=\"token punctuation\">.<\/span><span class=\"token function\">body<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;&lt;html&gt;&#8230;&lt;\/html&gt;&#034;<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u2500\u2500 text\/plain \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500<\/span><br \/>\nresponse<span class=\"token punctuation\">.<\/span><span class=\"token function\">set<\/span><span class=\"token punctuation\">(<\/span>http<span class=\"token double-colon punctuation\">::<\/span>field<span class=\"token double-colon punctuation\">::<\/span>content_type<span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;text\/plain&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\nbeast<span class=\"token double-colon punctuation\">::<\/span><span class=\"token function\">ostream<\/span><span class=\"token punctuation\">(<\/span>response<span class=\"token punctuation\">.<\/span><span class=\"token function\">body<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;File not found\\\\r\\\\n&#034;<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u2500\u2500 text\/json \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500<\/span><br \/>\nresponse<span class=\"token punctuation\">.<\/span><span class=\"token function\">set<\/span><span class=\"token punctuation\">(<\/span>http<span class=\"token double-colon punctuation\">::<\/span>field<span class=\"token double-colon punctuation\">::<\/span>content_type<span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;text\/json&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\nbeast<span class=\"token double-colon punctuation\">::<\/span><span class=\"token function\">ostream<\/span><span class=\"token punctuation\">(<\/span>response<span class=\"token punctuation\">.<\/span><span class=\"token function\">body<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&lt;&lt;<\/span> jsonstr<span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u9884\u5e8f\u5217\u5316\u7684 JSON \u5b57\u7b26\u4e32<\/span><\/p>\n<hr \/>\n<h3>\u8def\u7531&#xff1a;\u8bf7\u6c42\u5206\u53d1\u903b\u8f91<\/h3>\n<p>\u672c\u670d\u52a1\u5668\u652f\u6301\u7684\u8def\u7531\u8868&#xff1a;<\/p>\n<p>\u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u252c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u252c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510<br \/>\n\u2502  \u65b9\u6cd5     \u2502  \u8def\u5f84   \u2502  \u884c\u4e3a                         \u2502<br \/>\n\u251c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u253c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u253c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2524<br \/>\n\u2502  GET     \u2502 \/count \u2502  \u8fd4\u56de\u8bf7\u6c42\u8ba1\u6570\u5668 HTML \u9875\u9762       \u2502<br \/>\n\u2502  GET     \u2502 \/time  \u2502  \u8fd4\u56de\u5f53\u524d\u65f6\u95f4\u6233 HTML \u9875\u9762       \u2502<br \/>\n\u2502  GET     \u2502 \u5176\u4ed6   \u2502  404 Not Found                \u2502<br \/>\n\u2502  POST    \u2502 \/email \u2502  JSON \u89e3\u6790 \u2192 \u63d0\u53d6 email \u2192 \u54cd\u5e94 \u2502<br \/>\n\u2502  POST    \u2502 \u5176\u4ed6   \u2502  404 Not Found                \u2502<br \/>\n\u2502  \u5176\u4ed6    \u2502 \u4efb\u610f   \u2502  400 Bad Request              \u2502<br \/>\n\u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2534\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2534\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518<\/p>\n<h4>\u5206\u53d1\u5b9e\u73b0\u6a21\u5f0f<\/h4>\n<p><span class=\"token keyword\">switch<\/span> <span class=\"token punctuation\">(<\/span>request<span class=\"token punctuation\">.<\/span><span class=\"token function\">method<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token keyword\">case<\/span> http<span class=\"token double-colon punctuation\">::<\/span>verb<span class=\"token double-colon punctuation\">::<\/span>get<span class=\"token operator\">:<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u5904\u7406 GET<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>request<span class=\"token punctuation\">.<\/span><span class=\"token function\">target<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token string\">&#034;\/count&#034;<\/span><span class=\"token punctuation\">)<\/span>  <span class=\"token punctuation\">{<\/span> <span class=\"token comment\">\/* &#8230; *\/<\/span> <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">else<\/span> <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>request<span class=\"token punctuation\">.<\/span><span class=\"token function\">target<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token string\">&#034;\/time&#034;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token comment\">\/* &#8230; *\/<\/span> <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">else<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token comment\">\/* 404 *\/<\/span> <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">break<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">case<\/span> http<span class=\"token double-colon punctuation\">::<\/span>verb<span class=\"token double-colon punctuation\">::<\/span>post<span class=\"token operator\">:<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u5904\u7406 POST<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>request<span class=\"token punctuation\">.<\/span><span class=\"token function\">target<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token string\">&#034;\/email&#034;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token comment\">\/* JSON \u89e3\u6790 *\/<\/span> <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">else<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token comment\">\/* 404 *\/<\/span> <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">break<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">default<\/span><span class=\"token operator\">:<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u4e0d\u652f\u6301\u7684\u65b9\u6cd5 \u2192 400<\/span><br \/>\n    response<span class=\"token punctuation\">.<\/span><span class=\"token function\">result<\/span><span class=\"token punctuation\">(<\/span>http<span class=\"token double-colon punctuation\">::<\/span>status<span class=\"token double-colon punctuation\">::<\/span>bad_request<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">break<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h4>POST JSON \u89e3\u6790\u6d41\u7a0b<\/h4>\n<p><span class=\"token comment\">\/\/ 1. \u63d0\u53d6 body \u4e3a\u5b57\u7b26\u4e32<\/span><br \/>\n<span class=\"token keyword\">auto<\/span><span class=\"token operator\">&amp;<\/span> body <span class=\"token operator\">&#061;<\/span> request<span class=\"token punctuation\">.<\/span><span class=\"token function\">body<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">auto<\/span> body_str <span class=\"token operator\">&#061;<\/span> boost<span class=\"token double-colon punctuation\">::<\/span>beast<span class=\"token double-colon punctuation\">::<\/span><span class=\"token function\">buffers_to_string<\/span><span class=\"token punctuation\">(<\/span>body<span class=\"token punctuation\">.<\/span><span class=\"token function\">data<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ 2. jsoncpp \u89e3\u6790<\/span><br \/>\nJson<span class=\"token double-colon punctuation\">::<\/span>Value src_root<span class=\"token punctuation\">;<\/span><br \/>\nJson<span class=\"token double-colon punctuation\">::<\/span>Reader reader<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">bool<\/span> ok <span class=\"token operator\">&#061;<\/span> reader<span class=\"token punctuation\">.<\/span><span class=\"token function\">parse<\/span><span class=\"token punctuation\">(<\/span>body_str<span class=\"token punctuation\">,<\/span> src_root<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ 3. \u53d6\u5b57\u6bb5<\/span><br \/>\n<span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">!<\/span>ok<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u8fd4\u56de\u9519\u8bef JSON<\/span><br \/>\n    root<span class=\"token punctuation\">[<\/span><span class=\"token string\">&#034;error&#034;<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">1001<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">else<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">auto<\/span> email <span class=\"token operator\">&#061;<\/span> src_root<span class=\"token punctuation\">[<\/span><span class=\"token string\">&#034;email&#034;<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">asString<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    root<span class=\"token punctuation\">[<\/span><span class=\"token string\">&#034;error&#034;<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    root<span class=\"token punctuation\">[<\/span><span class=\"token string\">&#034;email&#034;<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> src_root<span class=\"token punctuation\">[<\/span><span class=\"token string\">&#034;email&#034;<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    root<span class=\"token punctuation\">[<\/span><span class=\"token string\">&#034;msg&#034;<\/span><span class=\"token punctuation\">]<\/span>   <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#034;receive email post success&#034;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ 4. \u5e8f\u5217\u5316\u5199\u5165\u54cd\u5e94\u4f53<\/span><br \/>\nstd<span class=\"token double-colon punctuation\">::<\/span>string jsonstr <span class=\"token operator\">&#061;<\/span> root<span class=\"token punctuation\">.<\/span><span class=\"token function\">toStyledString<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\nbeast<span class=\"token double-colon punctuation\">::<\/span><span class=\"token function\">ostream<\/span><span class=\"token punctuation\">(<\/span>response<span class=\"token punctuation\">.<\/span><span class=\"token function\">body<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&lt;&lt;<\/span> jsonstr<span class=\"token punctuation\">;<\/span><\/p>\n<hr \/>\n<h3>\u534f\u7a0b\u67b6\u6784\u901f\u89c8<\/h3>\n<h4>\u6838\u5fc3\u7c7b\u578b<\/h4>\n<p><span class=\"token keyword\">using<\/span> boost<span class=\"token double-colon punctuation\">::<\/span>asio<span class=\"token double-colon punctuation\">::<\/span>awaitable<span class=\"token punctuation\">;<\/span>       <span class=\"token comment\">\/\/ \u534f\u7a0b\u8fd4\u56de\u7c7b\u578b\u6a21\u677f<\/span><br \/>\n<span class=\"token keyword\">using<\/span> boost<span class=\"token double-colon punctuation\">::<\/span>asio<span class=\"token double-colon punctuation\">::<\/span>co_spawn<span class=\"token punctuation\">;<\/span>        <span class=\"token comment\">\/\/ \u542f\u52a8\u534f\u7a0b<\/span><br \/>\n<span class=\"token keyword\">using<\/span> boost<span class=\"token double-colon punctuation\">::<\/span>asio<span class=\"token double-colon punctuation\">::<\/span>detached<span class=\"token punctuation\">;<\/span>        <span class=\"token comment\">\/\/ fire-and-forget \u5b8c\u6210\u6807\u8bb0<\/span><br \/>\n<span class=\"token keyword\">using<\/span> boost<span class=\"token double-colon punctuation\">::<\/span>asio<span class=\"token double-colon punctuation\">::<\/span>use_awaitable<span class=\"token punctuation\">;<\/span>   <span class=\"token comment\">\/\/ \u9002\u914d\u5f02\u6b65\u64cd\u4f5c\u4e3a co_await \u53ef\u7528<\/span><\/p>\n<h4>\u58f0\u660e\u534f\u7a0b<\/h4>\n<p><span class=\"token comment\">\/\/ \u8fd4\u56de\u7c7b\u578b\u5fc5\u987b\u662f awaitable&lt;T&gt; \u6216 awaitable&lt;void&gt;<\/span><br \/>\nawaitable<span class=\"token operator\">&lt;<\/span><span class=\"token keyword\">void<\/span><span class=\"token operator\">&gt;<\/span> <span class=\"token function\">echo<\/span><span class=\"token punctuation\">(<\/span>tcp<span class=\"token double-colon punctuation\">::<\/span>socket socket<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u534f\u7a0b\u4f53 \u2014 \u652f\u6301 co_await, co_return<\/span><br \/>\n    <span class=\"token keyword\">co_await<\/span> <span class=\"token function\">some_async_operation<\/span><span class=\"token punctuation\">(<\/span>use_awaitable<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">co_return<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u53ef\u9009<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h4>\u542f\u52a8\u534f\u7a0b\u7684\u4e09\u79cd\u6a21\u5f0f<\/h4>\n<p><span class=\"token comment\">\/\/ \u2460 detached \u2014 \u4e0d\u5173\u5fc3\u7ed3\u679c&#xff0c;fire-and-forget<\/span><br \/>\n<span class=\"token function\">co_spawn<\/span><span class=\"token punctuation\">(<\/span>executor<span class=\"token punctuation\">,<\/span> <span class=\"token function\">echo<\/span><span class=\"token punctuation\">(<\/span>std<span class=\"token double-colon punctuation\">::<\/span><span class=\"token function\">move<\/span><span class=\"token punctuation\">(<\/span>socket<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> detached<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u2461 use_awaitable \u2014 \u7b49\u5f85\u5b50\u534f\u7a0b\u5b8c\u6210&#xff08;\u7528\u4e8e\u5d4c\u5957&#xff09;<\/span><br \/>\n<span class=\"token keyword\">co_await<\/span> <span class=\"token function\">co_spawn<\/span><span class=\"token punctuation\">(<\/span>executor<span class=\"token punctuation\">,<\/span> <span class=\"token function\">child_coro<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> use_awaitable<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u2462 \u81ea\u5b9a\u4e49 completion \u2014 \u4f20\u5165\u56de\u8c03\u51fd\u6570<\/span><br \/>\n<span class=\"token function\">co_spawn<\/span><span class=\"token punctuation\">(<\/span>executor<span class=\"token punctuation\">,<\/span> <span class=\"token function\">some_coro<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">(<\/span>std<span class=\"token double-colon punctuation\">::<\/span>exception_ptr ep<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token comment\">\/* &#8230; *\/<\/span> <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u672c\u670d\u52a1\u5668\u5168\u90e8\u4f7f\u7528 detached&#xff1a; listener \u4e0d\u9700\u8981\u8fd4\u56de\u503c&#xff0c;\u6bcf\u4e2a echo \u4e5f\u662f\u72ec\u7acb\u751f\u547d\u5468\u671f\u3002<\/p>\n<h4>\u83b7\u53d6\u5f53\u524d executor<\/h4>\n<p><span class=\"token keyword\">auto<\/span> executor <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">co_await<\/span> boost<span class=\"token double-colon punctuation\">::<\/span>asio<span class=\"token double-colon punctuation\">::<\/span>this_coro<span class=\"token double-colon punctuation\">::<\/span>executor<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token comment\">\/\/ executor \u662f\u4e0e\u5f53\u524d\u534f\u7a0b\u5173\u8054\u7684 io_context \u7ed1\u5b9a\u5bf9\u8c61<\/span><br \/>\n<span class=\"token comment\">\/\/ \u7528\u4e8e\u521b\u5efa timer\u3001acceptor \u7b49\u9700\u8981 executor \u7684\u5bf9\u8c61<\/span><\/p>\n<h4>\u9519\u8bef\u5904\u7406<\/h4>\n<p><span class=\"token comment\">\/\/ redirect_error \u5c06\u5f02\u6b65\u64cd\u4f5c\u7684\u9519\u8bef\u6355\u83b7\u5230 ec&#xff0c;\u800c\u4e0d\u662f\u629b\u51fa\u5f02\u5e38<\/span><br \/>\n<span class=\"token keyword\">co_await<\/span> socket<span class=\"token punctuation\">.<\/span><span class=\"token function\">async_read_some<\/span><span class=\"token punctuation\">(<\/span><br \/>\n    net<span class=\"token double-colon punctuation\">::<\/span><span class=\"token function\">buffer<\/span><span class=\"token punctuation\">(<\/span>data<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><br \/>\n    net<span class=\"token double-colon punctuation\">::<\/span><span class=\"token function\">redirect_error<\/span><span class=\"token punctuation\">(<\/span>use_awaitable<span class=\"token punctuation\">,<\/span> ec<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token comment\">\/\/                                    ^^<\/span><br \/>\n<span class=\"token comment\">\/\/                                    \u9519\u8bef\u88ab\u5199\u5165 ec<\/span><\/p>\n<p><span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>ec<span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token keyword\">co_return<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u6709\u9519\u8bef\u5219\u9000\u51fa\u534f\u7a0b<\/span><\/p>\n<h4>\u8d85\u65f6\u5b88\u62a4\u534f\u7a0b&#xff08;watchdog&#xff09;\u6a21\u5f0f<\/h4>\n<p><span class=\"token keyword\">template<\/span><span class=\"token operator\">&lt;<\/span><span class=\"token keyword\">typename<\/span> <span class=\"token class-name\">Socket<\/span><span class=\"token operator\">&gt;<\/span><br \/>\nawaitable<span class=\"token operator\">&lt;<\/span><span class=\"token keyword\">void<\/span><span class=\"token operator\">&gt;<\/span> <span class=\"token function\">watchdog<\/span><span class=\"token punctuation\">(<\/span>Socket<span class=\"token operator\">&amp;<\/span> socket<span class=\"token punctuation\">,<\/span> std<span class=\"token double-colon punctuation\">::<\/span>chrono<span class=\"token double-colon punctuation\">::<\/span>seconds duration<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">auto<\/span> executor <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">co_await<\/span> boost<span class=\"token double-colon punctuation\">::<\/span>asio<span class=\"token double-colon punctuation\">::<\/span>this_coro<span class=\"token double-colon punctuation\">::<\/span>executor<span class=\"token punctuation\">;<\/span><br \/>\n    net<span class=\"token double-colon punctuation\">::<\/span>steady_timer <span class=\"token function\">timer<\/span><span class=\"token punctuation\">(<\/span>executor<span class=\"token punctuation\">,<\/span> duration<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    beast<span class=\"token double-colon punctuation\">::<\/span>error_code ec<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">co_await<\/span> timer<span class=\"token punctuation\">.<\/span><span class=\"token function\">async_wait<\/span><span class=\"token punctuation\">(<\/span>net<span class=\"token double-colon punctuation\">::<\/span><span class=\"token function\">redirect_error<\/span><span class=\"token punctuation\">(<\/span>use_awaitable<span class=\"token punctuation\">,<\/span> ec<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">!<\/span>ec<span class=\"token punctuation\">)<\/span>  <span class=\"token comment\">\/\/ \u672a\u88ab\u53d6\u6d88&#xff0c;\u6b63\u5e38\u5230\u671f \u2192 \u5f3a\u5236\u5173\u95ed socket<\/span><br \/>\n        socket<span class=\"token punctuation\">.<\/span><span class=\"token function\">close<\/span><span class=\"token punctuation\">(<\/span>ec<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u4f7f\u7528&#xff1a;<\/span><br \/>\n<span class=\"token function\">co_spawn<\/span><span class=\"token punctuation\">(<\/span><br \/>\n    socket<span class=\"token punctuation\">.<\/span><span class=\"token function\">get_executor<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><br \/>\n    <span class=\"token function\">watchdog<\/span><span class=\"token punctuation\">(<\/span>socket<span class=\"token punctuation\">,<\/span> <span class=\"token number\">60<\/span>s<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span>  <span class=\"token comment\">\/\/ 60 \u79d2\u8d85\u65f6<\/span><br \/>\n    detached<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u539f\u7406&#xff1a; watchdog \u548c echo \u662f\u4e24\u4e2a\u72ec\u7acb\u7684\u534f\u7a0b&#xff0c;\u5171\u4eab\u540c\u4e00\u4e2a socket\u300260 \u79d2\u540e watchdog \u8c03\u7528 socket.close()&#xff0c;\u8fd9\u4f1a\u5bfc\u81f4 echo \u534f\u7a0b\u4e2d\u6240\u6709\u5728\u8be5 socket \u4e0a\u6302\u8d77\u7684\u5f02\u6b65\u64cd\u4f5c\u7acb\u5373\u4ee5 operation_aborted \u9519\u8bef\u8fd4\u56de\u3002<\/p>\n<hr \/>\n<h3>Asio \u57fa\u7840\u901f\u89c8<\/h3>\n<h4>io_context \u2014 \u4e8b\u4ef6\u5faa\u73af<\/h4>\n<p>net<span class=\"token double-colon punctuation\">::<\/span>io_context ioc<span class=\"token punctuation\">{<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u6784\u9020\u53c2\u6570&#061;1 \u8868\u793a\u63d0\u793a\u5355\u7ebf\u7a0b\u8fd0\u884c<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u6dfb\u52a0\u5f02\u6b65\u4efb\u52a1&#8230;<\/span><br \/>\n<span class=\"token function\">co_spawn<\/span><span class=\"token punctuation\">(<\/span>ioc<span class=\"token punctuation\">,<\/span> <span class=\"token function\">listener<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> detached<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u963b\u585e\u8fd0\u884c\u4e8b\u4ef6\u5faa\u73af<\/span><br \/>\nioc<span class=\"token punctuation\">.<\/span><span class=\"token function\">run<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u76f4\u5230 ioc.stop() \u88ab\u8c03\u7528\u6216\u6240\u6709\u4efb\u52a1\u5b8c\u6210<\/span><\/p>\n<h4>tcp::acceptor \u2014 \u76d1\u542c\u7aef\u53e3<\/h4>\n<p>tcp<span class=\"token double-colon punctuation\">::<\/span>acceptor <span class=\"token function\">acceptor<\/span><span class=\"token punctuation\">(<\/span>executor<span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">{<\/span>tcp<span class=\"token double-colon punctuation\">::<\/span><span class=\"token function\">v4<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">10086<\/span><span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token comment\">\/\/                              \u2502        \u2502<\/span><br \/>\n<span class=\"token comment\">\/\/                              \u2502        \u2514\u2500\u2500 \u7aef\u53e3\u53f7<\/span><br \/>\n<span class=\"token comment\">\/\/                              \u2514\u2500\u2500 IPv4<\/span><\/p>\n<p>\u5f02\u6b65\u63a5\u53d7\u8fde\u63a5&#xff1a;<\/p>\n<p>tcp<span class=\"token double-colon punctuation\">::<\/span>socket socket <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">co_await<\/span> acceptor<span class=\"token punctuation\">.<\/span><span class=\"token function\">async_accept<\/span><span class=\"token punctuation\">(<\/span>use_awaitable<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token comment\">\/\/ async_accept \u6302\u8d77\u534f\u7a0b&#xff0c;\u76f4\u5230\u6709\u5ba2\u6237\u7aef\u8fde\u63a5<\/span><br \/>\n<span class=\"token comment\">\/\/ \u8fd4\u56de\u4e00\u4e2a\u5df2\u5efa\u7acb\u8fde\u63a5\u7684 socket<\/span><\/p>\n<h4>tcp::socket \u2014 TCP \u8fde\u63a5<\/h4>\n<p><span class=\"token comment\">\/\/ socket \u63d0\u4f9b\u7684\u65b9\u6cd5&#xff1a;<\/span><br \/>\nsocket<span class=\"token punctuation\">.<\/span><span class=\"token function\">get_executor<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>     <span class=\"token comment\">\/\/ \u83b7\u53d6\u7ed1\u5b9a\u7684 executor<\/span><br \/>\nsocket<span class=\"token punctuation\">.<\/span><span class=\"token function\">close<\/span><span class=\"token punctuation\">(<\/span>ec<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>          <span class=\"token comment\">\/\/ \u5173\u95ed\u8fde\u63a5<\/span><br \/>\nsocket<span class=\"token punctuation\">.<\/span><span class=\"token function\">shutdown<\/span><span class=\"token punctuation\">(<\/span>           <span class=\"token comment\">\/\/ \u534a\u5173\u95ed<\/span><br \/>\n    tcp<span class=\"token double-colon punctuation\">::<\/span>socket<span class=\"token double-colon punctuation\">::<\/span>shutdown_send<span class=\"token punctuation\">,<\/span>  <span class=\"token comment\">\/\/ \u5173\u95ed\u53d1\u9001\u65b9\u5411&#xff08;\u53d1\u9001 FIN&#xff09;<\/span><br \/>\n    ec<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<h4>steady_timer \u2014 \u5b9a\u65f6\u5668<\/h4>\n<p>net<span class=\"token double-colon punctuation\">::<\/span>steady_timer <span class=\"token function\">timer<\/span><span class=\"token punctuation\">(<\/span>executor<span class=\"token punctuation\">,<\/span> std<span class=\"token double-colon punctuation\">::<\/span>chrono<span class=\"token double-colon punctuation\">::<\/span><span class=\"token function\">seconds<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">60<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u5f02\u6b65\u7b49\u5f85<\/span><br \/>\n<span class=\"token keyword\">co_await<\/span> timer<span class=\"token punctuation\">.<\/span><span class=\"token function\">async_wait<\/span><span class=\"token punctuation\">(<\/span>use_awaitable<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u53d6\u6d88\u5b9a\u65f6\u5668<\/span><br \/>\ntimer<span class=\"token punctuation\">.<\/span><span class=\"token function\">cancel<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ async_wait \u4ee5 operation_aborted \u8fd4\u56de<\/span><\/p>\n<h4>signal_set \u2014 \u4fe1\u53f7\u5904\u7406<\/h4>\n<p>net<span class=\"token double-colon punctuation\">::<\/span>signal_set <span class=\"token function\">signals<\/span><span class=\"token punctuation\">(<\/span>ioc<span class=\"token punctuation\">,<\/span> SIGINT<span class=\"token punctuation\">,<\/span> SIGTERM<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\nsignals<span class=\"token punctuation\">.<\/span><span class=\"token function\">async_wait<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">[<\/span><span class=\"token operator\">&amp;<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">(<\/span>beast<span class=\"token double-colon punctuation\">::<\/span>error_code ec<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> sig<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">!<\/span>ec<span class=\"token punctuation\">)<\/span> ioc<span class=\"token punctuation\">.<\/span><span class=\"token function\">stop<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u6536\u5230\u4fe1\u53f7 \u2192 \u505c\u6b62\u4e8b\u4ef6\u5faa\u73af<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<hr \/>\n<h3>\u884c\u7ea7\u6ce8\u91ca&#xff1a;\u5b8c\u6574\u6267\u884c\u6d41\u7a0b<\/h3>\n<h4>\u5165\u53e3&#xff1a;main()<\/h4>\n<p>1. io_context ioc{1} \u521b\u5efa<br \/>\n2. \u6ce8\u518c SIGINT\/SIGTERM \u4fe1\u53f7\u5904\u7406<br \/>\n3. co_spawn(ioc, listener(), detached) \u2014 \u542f\u52a8\u76d1\u542c\u534f\u7a0b<br \/>\n4. ioc.run() \u2014 \u963b\u585e&#xff0c;\u8fdb\u5165\u4e8b\u4ef6\u5faa\u73af<\/p>\n<h4>listener() \u2014 \u63a5\u53d7\u8fde\u63a5\u5faa\u73af<\/h4>\n<p>1. co_await this_coro::executor \u2192 \u83b7\u53d6 executor<br \/>\n2. \u521b\u5efa acceptor&#xff0c;\u7ed1\u5b9a 0.0.0.0:10086<br \/>\n3. for(;;) {<br \/>\n       socket &#061; co_await acceptor.async_accept(use_awaitable)<br \/>\n        \u2193 \u534f\u7a0b\u6302\u8d77&#xff0c;\u7b49\u5f85\u5ba2\u6237\u7aef\u8fde\u63a5<br \/>\n        \u2193 \u8fde\u63a5\u5230\u8fbe&#xff0c;\u62ff\u5230 socket<br \/>\n       co_spawn(executor, echo(std::move(socket)), detached)<br \/>\n        \u2192 \u542f\u52a8 echo \u534f\u7a0b&#xff0c;\u4e0d\u7b49\u5f85\u5176\u5b8c\u6210<br \/>\n   }<\/p>\n<h4>echo(socket) \u2014 \u5904\u7406\u5355\u4e2a\u8fde\u63a5<\/h4>\n<p>1. \u521b\u5efa\u5c40\u90e8\u53d8\u91cf buffer, request, response, ec, nbytes<br \/>\n2. co_spawn watchdog(socket, 60s) \u2014 \u542f\u52a8\u8d85\u65f6\u5b88\u62a4<br \/>\n3. co_await http::async_read(socket, buffer, request, &#8230;)<br \/>\n        \u2193 \u534f\u7a0b\u6302\u8d77&#xff0c;\u7b49\u5f85\u5b8c\u6574 HTTP \u8bf7\u6c42<br \/>\n        \u2193 \u8bf7\u6c42\u5230\u8fbe\u5e76\u89e3\u6790\u5b8c\u6210<br \/>\n4. if (ec) co_return \u2014 \u68c0\u67e5\u8bfb\u53d6\u9519\u8bef\/\u8d85\u65f6<br \/>\n5. \u6784\u9020\u54cd\u5e94&#xff08;switch request.method() \/ request.target()&#xff09;<br \/>\n6. co_await http::async_write(socket, response, &#8230;)<br \/>\n        \u2193 \u534f\u7a0b\u6302\u8d77&#xff0c;\u7b49\u5f85\u53d1\u9001\u5b8c\u6210<br \/>\n7. socket.shutdown(shutdown_send) \u2014 \u4f18\u96c5\u5173\u95ed<br \/>\n8. \u51fd\u6570\u7ed3\u675f \u2192 \u534f\u7a0b\u5e27\u9500\u6bc1&#xff0c;socket \u81ea\u52a8\u5173\u95ed<\/p>\n<hr \/>\n<h3>\u81ea\u884c\u5b9e\u73b0\u6e05\u5355<\/h3>\n<p>\u6309\u4ee5\u4e0b\u987a\u5e8f\u9010\u6b65\u6784\u5efa\u670d\u52a1\u5668&#xff1a;<\/p>\n<h4>Phase 1&#xff1a;\u9aa8\u67b6<\/h4>\n<ul>\n<li class=\"task-list-item\"> \u521b\u5efa io_context&#xff0c;\u8c03\u7528 ioc.run()<\/li>\n<li class=\"task-list-item\"> \u521b\u5efa tcp::acceptor \u7ed1\u5b9a\u7aef\u53e3<\/li>\n<li class=\"task-list-item\"> \u7528 async_accept \u63a5\u53d7\u4e00\u4e2a\u8fde\u63a5<\/li>\n<li class=\"task-list-item\"> \u9a8c\u8bc1\u80fd\u63a5\u53d7 curl \u8fde\u63a5<\/li>\n<\/ul>\n<h4>Phase 2&#xff1a;\u534f\u7a0b\u5316<\/h4>\n<ul>\n<li class=\"task-list-item\"> \u628a accept \u903b\u8f91\u653e\u5165 awaitable&lt;void&gt; listener()<\/li>\n<li class=\"task-list-item\"> \u7528 co_spawn &#043; detached \u542f\u52a8 listener<\/li>\n<li class=\"task-list-item\"> \u6539\u7528 co_await async_accept(use_awaitable)<\/li>\n<\/ul>\n<h4>Phase 3&#xff1a;\u8bfb\u53d6 HTTP \u8bf7\u6c42<\/h4>\n<ul>\n<li class=\"task-list-item\"> \u5728 echo \u534f\u7a0b\u4e2d\u521b\u5efa flat_buffer \u548c http::request&lt;http::dynamic_body&gt;<\/li>\n<li class=\"task-list-item\"> \u8c03\u7528 co_await http::async_read(socket, buffer, request, redirect_error(use_awaitable, ec))<\/li>\n<li class=\"task-list-item\"> \u6253\u5370 request.method_string() \u548c request.target() \u9a8c\u8bc1\u89e3\u6790\u6b63\u786e<\/li>\n<\/ul>\n<h4>Phase 4&#xff1a;\u6784\u9020\u5e76\u53d1\u9001\u54cd\u5e94<\/h4>\n<ul>\n<li class=\"task-list-item\"> \u521b\u5efa http::response&lt;http::dynamic_body&gt;<\/li>\n<li class=\"task-list-item\"> \u8bbe\u7f6e version\u3001keep_alive\u3001result\u3001content_type<\/li>\n<li class=\"task-list-item\"> \u7528 beast::ostream(response.body()) \u5199\u5165\u5185\u5bb9<\/li>\n<li class=\"task-list-item\"> response.content_length(response.body().size())<\/li>\n<li class=\"task-list-item\"> co_await http::async_write(&#8230;) \u53d1\u9001<\/li>\n<li class=\"task-list-item\"> socket.shutdown(shutdown_send, ec)<\/li>\n<\/ul>\n<h4>Phase 5&#xff1a;\u8def\u7531<\/h4>\n<ul>\n<li class=\"task-list-item\"> \u5b9e\u73b0 switch(request.method()) \u8def\u7531<\/li>\n<li class=\"task-list-item\"> GET \/count\u3001GET \/time\u3001404<\/li>\n<li class=\"task-list-item\"> POST \/email&#xff1a;buffers_to_string &#043; jsoncpp \u89e3\u6790<\/li>\n<\/ul>\n<h4>Phase 6&#xff1a;\u5b8c\u5584<\/h4>\n<ul>\n<li class=\"task-list-item\"> \u6dfb\u52a0 watchdog \u8d85\u65f6\u534f\u7a0b<\/li>\n<li class=\"task-list-item\"> \u6dfb\u52a0 signal_set \u4f18\u96c5\u9000\u51fa<\/li>\n<li class=\"task-list-item\"> \u6dfb\u52a0 for(;;) accept \u5faa\u73af<\/li>\n<\/ul>\n<hr \/>\n<h3>\u5feb\u901f\u53c2\u8003\u5361<\/h3>\n<p><span class=\"token comment\">\/\/ \u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550<\/span><br \/>\n<span class=\"token comment\">\/\/  \u7c7b\u578b\u901f\u67e5<\/span><br \/>\n<span class=\"token comment\">\/\/ \u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u8bf7\u6c42<\/span><br \/>\nhttp<span class=\"token double-colon punctuation\">::<\/span>request<span class=\"token operator\">&lt;<\/span>http<span class=\"token double-colon punctuation\">::<\/span>dynamic_body<span class=\"token operator\">&gt;<\/span> req<span class=\"token punctuation\">;<\/span><br \/>\nreq<span class=\"token punctuation\">.<\/span><span class=\"token function\">method<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span>              <span class=\"token comment\">\/\/ \u2192 http::verb (\u679a\u4e3e)<\/span><br \/>\nreq<span class=\"token punctuation\">.<\/span><span class=\"token function\">method_string<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span>       <span class=\"token comment\">\/\/ \u2192 string_view (&#034;GET&#034;, &#034;POST&#034;&#8230;)<\/span><br \/>\nreq<span class=\"token punctuation\">.<\/span><span class=\"token function\">target<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span>              <span class=\"token comment\">\/\/ \u2192 string_view (&#034;\/count&#034;, &#034;\/time&#034;&#8230;)<\/span><br \/>\nreq<span class=\"token punctuation\">.<\/span><span class=\"token function\">version<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span>             <span class=\"token comment\">\/\/ \u2192 unsigned (10&#061;1.0, 11&#061;1.1)<\/span><br \/>\nreq<span class=\"token punctuation\">.<\/span><span class=\"token function\">set<\/span><span class=\"token punctuation\">(<\/span>field<span class=\"token punctuation\">,<\/span> value<span class=\"token punctuation\">)<\/span>     <span class=\"token comment\">\/\/ \u2192 \u8bbe\u7f6e\u5934\u90e8<\/span><br \/>\nreq<span class=\"token punctuation\">[<\/span>field<span class=\"token punctuation\">]<\/span>                <span class=\"token comment\">\/\/ \u2192 \u8bfb\u53d6\u5934\u90e8\u503c<\/span><br \/>\nreq<span class=\"token punctuation\">.<\/span><span class=\"token function\">body<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span>                <span class=\"token comment\">\/\/ \u2192 dynamic_body&amp;<\/span><br \/>\nreq<span class=\"token punctuation\">.<\/span><span class=\"token function\">body<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">size<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span>         <span class=\"token comment\">\/\/ \u2192 body \u5b57\u8282\u6570<\/span><br \/>\nreq<span class=\"token punctuation\">.<\/span><span class=\"token function\">body<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">data<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span>         <span class=\"token comment\">\/\/ \u2192 ConstBufferSequence<\/span><br \/>\nreq<span class=\"token punctuation\">.<\/span><span class=\"token function\">keep_alive<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span>          <span class=\"token comment\">\/\/ \u2192 bool<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u54cd\u5e94<\/span><br \/>\nhttp<span class=\"token double-colon punctuation\">::<\/span>response<span class=\"token operator\">&lt;<\/span>http<span class=\"token double-colon punctuation\">::<\/span>dynamic_body<span class=\"token operator\">&gt;<\/span> res<span class=\"token punctuation\">;<\/span><br \/>\nres<span class=\"token punctuation\">.<\/span><span class=\"token function\">result<\/span><span class=\"token punctuation\">(<\/span>status<span class=\"token punctuation\">)<\/span>        <span class=\"token comment\">\/\/ \u2192 \u8bbe\u7f6e\u72b6\u6001\u7801<\/span><br \/>\nres<span class=\"token punctuation\">.<\/span><span class=\"token function\">version<\/span><span class=\"token punctuation\">(<\/span>v<span class=\"token punctuation\">)<\/span>            <span class=\"token comment\">\/\/ \u2192 \u8bbe\u7f6e\u7248\u672c<\/span><br \/>\nres<span class=\"token punctuation\">.<\/span><span class=\"token function\">keep_alive<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">bool<\/span><span class=\"token punctuation\">)<\/span>      <span class=\"token comment\">\/\/ \u2192 \u8fde\u63a5\u6a21\u5f0f<\/span><br \/>\nres<span class=\"token punctuation\">.<\/span><span class=\"token function\">set<\/span><span class=\"token punctuation\">(<\/span>field<span class=\"token punctuation\">,<\/span> value<span class=\"token punctuation\">)<\/span>     <span class=\"token comment\">\/\/ \u2192 \u8bbe\u7f6e\u5934\u90e8<\/span><br \/>\nres<span class=\"token punctuation\">.<\/span><span class=\"token function\">content_length<\/span><span class=\"token punctuation\">(<\/span>n<span class=\"token punctuation\">)<\/span>     <span class=\"token comment\">\/\/ \u2192 \u8bbe\u7f6e Content-Length<\/span><br \/>\nres<span class=\"token punctuation\">.<\/span><span class=\"token function\">body<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span>                <span class=\"token comment\">\/\/ \u2192 dynamic_body&amp;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u7f13\u51b2\u533a\u4e0e\u5de5\u5177<\/span><br \/>\nbeast<span class=\"token double-colon punctuation\">::<\/span>flat_buffer buf<span class=\"token punctuation\">{<\/span><span class=\"token number\">8192<\/span><span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span>            <span class=\"token comment\">\/\/ \u8bfb\u7f13\u51b2<\/span><br \/>\nbeast<span class=\"token double-colon punctuation\">::<\/span><span class=\"token function\">ostream<\/span><span class=\"token punctuation\">(<\/span>res<span class=\"token punctuation\">.<\/span><span class=\"token function\">body<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;&#8230;&#034;<\/span><span class=\"token punctuation\">;<\/span>     <span class=\"token comment\">\/\/ \u6d41\u5f0f\u5199\u5165 body<\/span><br \/>\nbeast<span class=\"token double-colon punctuation\">::<\/span><span class=\"token function\">buffers_to_string<\/span><span class=\"token punctuation\">(<\/span>buf<span class=\"token punctuation\">.<\/span><span class=\"token function\">data<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>    <span class=\"token comment\">\/\/ \u7f13\u51b2\u2192string<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u5f02\u6b65 I\/O<\/span><br \/>\n<span class=\"token keyword\">co_await<\/span> http<span class=\"token double-colon punctuation\">::<\/span><span class=\"token function\">async_read<\/span><span class=\"token punctuation\">(<\/span>sock<span class=\"token punctuation\">,<\/span> buf<span class=\"token punctuation\">,<\/span> req<span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>   <span class=\"token comment\">\/\/ \u8bfb\u8bf7\u6c42<\/span><br \/>\n<span class=\"token keyword\">co_await<\/span> http<span class=\"token double-colon punctuation\">::<\/span><span class=\"token function\">async_write<\/span><span class=\"token punctuation\">(<\/span>sock<span class=\"token punctuation\">,<\/span> res<span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>        <span class=\"token comment\">\/\/ \u5199\u54cd\u5e94<\/span><br \/>\n<span class=\"token keyword\">co_await<\/span> sock<span class=\"token punctuation\">.<\/span><span class=\"token function\">async_accept<\/span><span class=\"token punctuation\">(<\/span>use_awaitable<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>          <span class=\"token comment\">\/\/ \u63a5\u53d7\u8fde\u63a5<\/span><br \/>\n<span class=\"token keyword\">co_await<\/span> timer<span class=\"token punctuation\">.<\/span><span class=\"token function\">async_wait<\/span><span class=\"token punctuation\">(<\/span>use_awaitable<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>           <span class=\"token comment\">\/\/ \u7b49\u5f85\u5b9a\u65f6\u5668<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u9519\u8bef\u5904\u7406<\/span><br \/>\nbeast<span class=\"token double-colon punctuation\">::<\/span>error_code ec<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">co_await<\/span> <span class=\"token function\">op<\/span><span class=\"token punctuation\">(<\/span>net<span class=\"token double-colon punctuation\">::<\/span><span class=\"token function\">redirect_error<\/span><span class=\"token punctuation\">(<\/span>use_awaitable<span class=\"token punctuation\">,<\/span> ec<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>ec<span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">co_return<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550<\/span><br \/>\n<span class=\"token comment\">\/\/  \u5e38\u7528\u679a\u4e3e\u503c<\/span><br \/>\n<span class=\"token comment\">\/\/ \u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550<\/span><\/p>\n<p><span class=\"token comment\">\/\/ http::verb<\/span><br \/>\nverb<span class=\"token double-colon punctuation\">::<\/span>get     verb<span class=\"token double-colon punctuation\">::<\/span>post    verb<span class=\"token double-colon punctuation\">::<\/span>put<br \/>\nverb<span class=\"token double-colon punctuation\">::<\/span>delete_ verb<span class=\"token double-colon punctuation\">::<\/span>head    verb<span class=\"token double-colon punctuation\">::<\/span>options<\/p>\n<p><span class=\"token comment\">\/\/ http::field<\/span><br \/>\nfield<span class=\"token double-colon punctuation\">::<\/span>server         field<span class=\"token double-colon punctuation\">::<\/span>content_type<br \/>\nfield<span class=\"token double-colon punctuation\">::<\/span>content_length field<span class=\"token double-colon punctuation\">::<\/span>host<br \/>\nfield<span class=\"token double-colon punctuation\">::<\/span>user_agent     field<span class=\"token double-colon punctuation\">::<\/span>accept<br \/>\nfield<span class=\"token double-colon punctuation\">::<\/span>connection<\/p>\n<p><span class=\"token comment\">\/\/ http::status<\/span><br \/>\nstatus<span class=\"token double-colon punctuation\">::<\/span>ok                <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">200<\/span>   status<span class=\"token double-colon punctuation\">::<\/span>created      <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">201<\/span><br \/>\nstatus<span class=\"token double-colon punctuation\">::<\/span>bad_request       <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">400<\/span>   status<span class=\"token double-colon punctuation\">::<\/span>not_found    <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">404<\/span><br \/>\nstatus<span class=\"token double-colon punctuation\">::<\/span>method_not_allowed<span class=\"token operator\">&#061;<\/span> <span class=\"token number\">405<\/span>   status<span class=\"token double-colon punctuation\">::<\/span>server_error <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">500<\/span><\/p>\n<hr \/>\n<h3>\u4e0e\u56de\u8c03\u7248\u7684\u5173\u952e\u5dee\u5f02\u5bf9\u7167<\/h3>\n<table>\n<tr>\u65b9\u9762\u56de\u8c03\u7248\u534f\u7a0b\u7248<\/tr>\n<tbody>\n<tr>\n<td>C&#043;&#043; \u6807\u51c6<\/td>\n<td>C&#043;&#043;17<\/td>\n<td>C&#043;&#043;20<\/td>\n<\/tr>\n<tr>\n<td>\u7c7b\u5b9a\u4e49<\/td>\n<td>class http_connection : enable_shared_from_this<\/td>\n<td>\u53ea\u9700 awaitable&lt;void&gt; echo(socket) 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