{"id":37264,"date":"2025-05-15T08:16:24","date_gmt":"2025-05-15T00:16:24","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/37264.html"},"modified":"2025-05-15T08:16:24","modified_gmt":"2025-05-15T00:16:24","slug":"%e3%80%90python%e3%80%91sse_starlette-%e5%ba%93%ef%bc%9a%e4%b8%ba-starlette-%e5%92%8c-fastapi-%e6%a1%86%e6%9e%b6%e6%8f%90%e4%be%9b%e5%af%b9-server-sent-events%ef%bc%88sse%ef%bc%8c%e6%9c%8d%e5%8a%a1","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/37264.html","title":{"rendered":"\u3010Python\u3011sse_starlette \u5e93\uff1a\u4e3a Starlette \u548c FastAPI \u6846\u67b6\u63d0\u4f9b\u5bf9 Server-Sent Events\uff08SSE\uff0c\u670d\u52a1\u5668\u63a8\u9001\u4e8b\u4ef6\uff09\u7684\u652f\u6301"},"content":{"rendered":"<p>sse_starlette \u662f\u4e00\u4e2a Python \u5e93&#xff0c;\u4e3a Starlette \u548c FastAPI \u6846\u67b6\u63d0\u4f9b\u5bf9 Server-Sent Events&#xff08;SSE&#xff0c;\u670d\u52a1\u5668\u63a8\u9001\u4e8b\u4ef6&#xff09;\u7684\u652f\u6301\u3002\u5b83\u901a\u8fc7 EventSourceResponse \u7c7b\u5b9e\u73b0 SSE \u534f\u8bae&#xff0c;\u5141\u8bb8\u670d\u52a1\u5668\u5f02\u6b65\u5411\u5ba2\u6237\u7aef\u63a8\u9001\u5b9e\u65f6\u6570\u636e&#xff0c;\u9002\u5408\u6784\u5efa\u5b9e\u65f6 Web \u5e94\u7528&#xff0c;\u5982\u901a\u77e5\u7cfb\u7edf\u3001\u5b9e\u65f6\u4eea\u8868\u76d8\u6216\u6d41\u5f0f\u6570\u636e\u66f4\u65b0\u3002sse_starlette \u8f7b\u91cf\u4e14\u4e0e ASGI \u6846\u67b6\u65e0\u7f1d\u96c6\u6210&#xff0c;\u5e38\u7528\u4e8e\u9700\u8981\u9ad8\u6548\u5355\u5411\u901a\u4fe1\u7684\u573a\u666f\u3002<\/p>\n<p>\u4ee5\u4e0b\u662f\u5bf9 sse_starlette \u5e93\u7684\u8be6\u7ec6\u4ecb\u7ecd&#xff0c;\u5305\u62ec\u5176\u529f\u80fd\u3001\u7528\u6cd5\u548c\u5b9e\u9645\u5e94\u7528&#xff0c;\u57fa\u4e8e\u6700\u65b0\u4fe1\u606f&#xff08;\u622a\u81f3 2025&#xff09;\u3002<\/p>\n<hr \/>\n<h4>1. sse_starlette \u5e93\u7684\u4f5c\u7528<\/h4>\n<ul>\n<li>SSE \u652f\u6301&#xff1a;\u4e3a Starlette\/FastAPI \u63d0\u4f9b\u6807\u51c6\u5316\u7684 SSE \u5b9e\u73b0&#xff0c;\u57fa\u4e8e HTML5 EventSource API\u3002<\/li>\n<li>\u5b9e\u65f6\u6570\u636e\u63a8\u9001&#xff1a;\u652f\u6301\u670d\u52a1\u5668\u5230\u5ba2\u6237\u7aef\u7684\u5355\u5411\u6570\u636e\u6d41&#xff0c;\u9002\u5408\u5b9e\u65f6\u66f4\u65b0\u3002<\/li>\n<li>\u9ad8\u6027\u80fd&#xff1a;\u5229\u7528 asyncio \u548c anyio \u7684\u5f02\u6b65\u4efb\u52a1\u7ec4&#xff08;TaskGroups&#xff09;&#xff0c;\u786e\u4fdd\u9ad8\u6548\u5e76\u53d1\u3002<\/li>\n<li>\u6613\u4e8e\u96c6\u6210&#xff1a;\u4e0e Starlette\/FastAPI \u65e0\u7f1d\u517c\u5bb9&#xff0c;\u652f\u6301\u81ea\u5b9a\u4e49\u4e8b\u4ef6\u548c\u5934\u90e8\u3002<\/li>\n<li>\u5065\u58ee\u6027&#xff1a;\u5904\u7406\u5ba2\u6237\u7aef\u65ad\u5f00\u3001\u670d\u52a1\u5668\u5173\u95ed\u548c\u975e\u7ebf\u7a0b\u5b89\u5168\u5bf9\u8c61&#xff0c;\u589e\u5f3a\u53ef\u9760\u6027\u3002<\/li>\n<\/ul>\n<p>\u8fd1\u671f\u52a8\u6001&#xff1a;<\/p>\n<ul>\n<li>\u6700\u65b0\u7248\u672c&#xff1a;2.3.4&#xff08;\u622a\u81f3 2025-05-04&#xff0c;PyPI&#xff09;\u3002<\/li>\n<li>\u65b0\u589e\u529f\u80fd&#xff1a;\n<ul>\n<li>\u652f\u6301\u81ea\u5b9a\u4e49 ping \u95f4\u9694\u548c\u6d88\u606f\u5de5\u5382&#xff08;ping_message_factory&#xff09;\u3002<\/li>\n<li>\u4fee\u590d\u591a SSE \u7aef\u70b9\u6d4b\u8bd5\u4e2d\u7684\u4e8b\u4ef6\u5faa\u73af\u7ed1\u5b9a\u95ee\u9898&#xff08;Issue #59&#xff09;\u3002<\/li>\n<li>\u589e\u5f3a\u4e0e anyio \u7684\u96c6\u6210&#xff0c;\u4f18\u5316\u4efb\u52a1\u7ba1\u7406\u3002<\/li>\n<\/ul>\n<\/li>\n<li>\u793e\u533a\u6d3b\u8dc3&#xff1a;GitHub \u4ed3\u5e93&#xff08;https:\/\/github.com\/sysid\/sse-starlette&#xff09;\u6709 592 \u661f&#xff0c;30 \u4f4d\u8d21\u732e\u8005&#xff0c;\u7ef4\u62a4\u5065\u5eb7\u3002<\/li>\n<li>\u6ce8\u610f\u4e8b\u9879&#xff1a;\u4e0d\u652f\u6301 GZipMiddleware&#xff0c;\u9700\u786e\u4fdd\u4efb\u52a1\u5728\u5173\u95ed\u65f6\u6e05\u7406\u4ee5\u907f\u514d\u8b66\u544a\u3002<\/li>\n<\/ul>\n<hr \/>\n<h4>2. \u5b89\u88c5\u4e0e\u73af\u5883\u8981\u6c42<\/h4>\n<ul>\n<li>Python \u7248\u672c&#xff1a;\u652f\u6301 Python 3.8&#043;&#xff08;\u63a8\u8350 3.9&#043;&#xff09;\u3002<\/li>\n<li>\u6838\u5fc3\u4f9d\u8d56&#xff1a;\n<ul>\n<li>starlette&#xff1a;ASGI \u6846\u67b6\u57fa\u7840\u3002<\/li>\n<li>anyio&#xff1a;\u5f02\u6b65\u4efb\u52a1\u7ba1\u7406&#xff08;\u6700\u4f4e 3.6.2&#xff09;\u3002<\/li>\n<li>\u53ef\u9009&#xff1a;uvicorn&#xff08;\u8fd0\u884c ASGI \u5e94\u7528&#xff09;\u3001httpx&#xff08;\u6d4b\u8bd5&#xff09;\u3002<\/li>\n<\/ul>\n<\/li>\n<li>\u5b89\u88c5\u547d\u4ee4&#xff1a;pip <span class=\"token function\">install<\/span> sse-starlette\n <\/li>\n<li>\u5b8c\u6574\u5b89\u88c5&#xff08;\u5305\u62ec\u8fd0\u884c\u548c\u6d4b\u8bd5&#xff09;&#xff1a;pip <span class=\"token function\">install<\/span> sse-starlette uvicorn httpx\n <\/li>\n<li>\u9a8c\u8bc1\u5b89\u88c5&#xff1a;<span class=\"token keyword\">import<\/span> sse_starlette<br \/>\n<span class=\"token keyword\">print<\/span><span class=\"token punctuation\">(<\/span>sse_starlette<span class=\"token punctuation\">.<\/span>__version__<span class=\"token punctuation\">)<\/span>  <span class=\"token comment\"># \u793a\u4f8b\u8f93\u51fa: 2.3.4<\/span>\n <\/li>\n<\/ul>\n<p>\u7cfb\u7edf\u8981\u6c42&#xff1a;<\/p>\n<ul>\n<li>\u786e\u4fdd uvicorn \u548c starlette \u7248\u672c\u517c\u5bb9&#xff08;starlette&gt;&#061;0.26.1&#xff09;\u3002<\/li>\n<li>\u6d4b\u8bd5\u73af\u5883\u53ef\u80fd\u9700 pytest \u548c pytest-asyncio&#xff1a;pip <span class=\"token function\">install<\/span> pytest pytest-asyncio\n <\/li>\n<\/ul>\n<hr \/>\n<h4>3. \u6838\u5fc3\u529f\u80fd\u4e0e\u7528\u6cd5<\/h4>\n<p>sse_starlette \u63d0\u4f9b EventSourceResponse \u7c7b&#xff0c;\u7528\u4e8e\u521b\u5efa SSE \u54cd\u5e94&#xff0c;\u652f\u6301\u5f02\u6b65\u751f\u6210\u5668\u3001\u81ea\u5b9a\u4e49\u4e8b\u4ef6\u548c\u8fde\u63a5\u7ba1\u7406\u3002\u4ee5\u4e0b\u662f\u4e3b\u8981\u529f\u80fd\u548c\u793a\u4f8b\u3002<\/p>\n<h5>3.1 \u57fa\u672c SSE \u5b9e\u73b0<\/h5>\n<p>\u4f7f\u7528\u5f02\u6b65\u751f\u6210\u5668\u63a8\u9001\u4e8b\u4ef6\u3002<\/p>\n<p><span class=\"token keyword\">import<\/span> asyncio<br \/>\n<span class=\"token keyword\">import<\/span> uvicorn<br \/>\n<span class=\"token keyword\">from<\/span> starlette<span class=\"token punctuation\">.<\/span>applications <span class=\"token keyword\">import<\/span> Starlette<br \/>\n<span class=\"token keyword\">from<\/span> starlette<span class=\"token punctuation\">.<\/span>routing <span class=\"token keyword\">import<\/span> Route<br \/>\n<span class=\"token keyword\">from<\/span> sse_starlette<span class=\"token punctuation\">.<\/span>sse <span class=\"token keyword\">import<\/span> EventSourceResponse<\/p>\n<p><span class=\"token keyword\">async<\/span> <span class=\"token keyword\">def<\/span> <span class=\"token function\">numbers<\/span><span class=\"token punctuation\">(<\/span>minimum<span class=\"token punctuation\">:<\/span> <span class=\"token builtin\">int<\/span><span class=\"token punctuation\">,<\/span> maximum<span class=\"token punctuation\">:<\/span> <span class=\"token builtin\">int<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">:<\/span><br \/>\n    <span class=\"token keyword\">for<\/span> i <span class=\"token keyword\">in<\/span> <span class=\"token builtin\">range<\/span><span class=\"token punctuation\">(<\/span>minimum<span class=\"token punctuation\">,<\/span> maximum <span class=\"token operator\">&#043;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">:<\/span><br \/>\n        <span class=\"token keyword\">await<\/span> asyncio<span class=\"token punctuation\">.<\/span>sleep<span class=\"token punctuation\">(<\/span><span class=\"token number\">0.9<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token keyword\">yield<\/span> <span class=\"token builtin\">dict<\/span><span class=\"token punctuation\">(<\/span>data<span class=\"token operator\">&#061;<\/span>i<span class=\"token punctuation\">)<\/span><\/p>\n<p><span class=\"token keyword\">async<\/span> <span class=\"token keyword\">def<\/span> <span class=\"token function\">sse<\/span><span class=\"token punctuation\">(<\/span>request<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">:<\/span><br \/>\n    generator <span class=\"token operator\">&#061;<\/span> numbers<span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">5<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> EventSourceResponse<span class=\"token punctuation\">(<\/span>generator<span class=\"token punctuation\">)<\/span><\/p>\n<p>routes <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">[<\/span><br \/>\n    Route<span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\/&#034;<\/span><span class=\"token punctuation\">,<\/span> endpoint<span class=\"token operator\">&#061;<\/span>sse<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">]<\/span><\/p>\n<p>app <span class=\"token operator\">&#061;<\/span> Starlette<span class=\"token punctuation\">(<\/span>debug<span class=\"token operator\">&#061;<\/span><span class=\"token boolean\">True<\/span><span class=\"token punctuation\">,<\/span> routes<span class=\"token operator\">&#061;<\/span>routes<span class=\"token punctuation\">)<\/span><\/p>\n<p><span class=\"token keyword\">if<\/span> __name__ <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token string\">&#034;__main__&#034;<\/span><span class=\"token punctuation\">:<\/span><br \/>\n    uvicorn<span class=\"token punctuation\">.<\/span>run<span class=\"token punctuation\">(<\/span>app<span class=\"token punctuation\">,<\/span> host<span class=\"token operator\">&#061;<\/span><span class=\"token string\">&#034;0.0.0.0&#034;<\/span><span class=\"token punctuation\">,<\/span> port<span class=\"token operator\">&#061;<\/span><span class=\"token number\">8000<\/span><span class=\"token punctuation\">,<\/span> log_level<span class=\"token operator\">&#061;<\/span><span class=\"token string\">&#034;info&#034;<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p>\u8fd0\u884c&#xff1a;<\/p>\n<p>python sse_example.py<\/p>\n<p>\u5ba2\u6237\u7aef\u6d4b\u8bd5&#xff08;\u4f7f\u7528 curl&#xff09;&#xff1a;<\/p>\n<p><span class=\"token function\">curl<\/span> -N http:\/\/localhost:8000<\/p>\n<p>\u8f93\u51fa\u793a\u4f8b&#xff1a;<\/p>\n<p>data: 1<\/p>\n<p>data: 2<\/p>\n<p>data: 3<\/p>\n<p>data: 4<\/p>\n<p>data: 5<\/p>\n<p>\u8bf4\u660e&#xff1a;<\/p>\n<ul>\n<li>EventSourceResponse \u63a5\u53d7\u5f02\u6b65\u751f\u6210\u5668&#xff0c;\u63a8\u9001 data \u5b57\u6bb5\u3002<\/li>\n<li>\u6bcf 0.9 \u79d2\u53d1\u9001\u4e00\u4e2a\u6570\u5b57&#xff0c;\u7b26\u5408 SSE \u534f\u8bae&#xff08;text\/event-stream&#xff09;\u3002<\/li>\n<li>\u9ed8\u8ba4\u6bcf 15 \u79d2\u53d1\u9001 ping \u4fdd\u6301\u8fde\u63a5\u3002<\/li>\n<\/ul>\n<h5>3.2 \u81ea\u5b9a\u4e49\u4e8b\u4ef6<\/h5>\n<p>\u6307\u5b9a\u4e8b\u4ef6\u540d\u79f0\u3001ID \u548c\u591a\u884c\u6570\u636e\u3002<\/p>\n<p><span class=\"token keyword\">from<\/span> fastapi <span class=\"token keyword\">import<\/span> FastAPI<span class=\"token punctuation\">,<\/span> Request<br \/>\n<span class=\"token keyword\">from<\/span> sse_starlette<span class=\"token punctuation\">.<\/span>sse <span class=\"token keyword\">import<\/span> EventSourceResponse<span class=\"token punctuation\">,<\/span> ServerSentEvent<br \/>\n<span class=\"token keyword\">import<\/span> asyncio<br \/>\n<span class=\"token keyword\">import<\/span> time<\/p>\n<p>app <span class=\"token operator\">&#061;<\/span> FastAPI<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p><span class=\"token decorator annotation punctuation\">&#064;app<span class=\"token punctuation\">.<\/span>get<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\/stream&#034;<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token keyword\">async<\/span> <span class=\"token keyword\">def<\/span> <span class=\"token function\">sse_stream<\/span><span class=\"token punctuation\">(<\/span>request<span class=\"token punctuation\">:<\/span> Request<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">:<\/span><br \/>\n    <span class=\"token keyword\">async<\/span> <span class=\"token keyword\">def<\/span> <span class=\"token function\">event_generator<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">:<\/span><br \/>\n        <span class=\"token keyword\">for<\/span> i <span class=\"token keyword\">in<\/span> <span class=\"token builtin\">range<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">6<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">:<\/span><br \/>\n            <span class=\"token keyword\">if<\/span> <span class=\"token keyword\">await<\/span> request<span class=\"token punctuation\">.<\/span>is_disconnected<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">:<\/span><br \/>\n                <span class=\"token keyword\">break<\/span><br \/>\n            msg <span class=\"token operator\">&#061;<\/span> <span class=\"token string-interpolation\"><span class=\"token string\">f&#034;Update <\/span><span class=\"token interpolation\"><span class=\"token punctuation\">{<\/span>i<span class=\"token punctuation\">}<\/span><\/span><span class=\"token string\">\\\\nTime: <\/span><span class=\"token interpolation\"><span class=\"token punctuation\">{<\/span>time<span class=\"token punctuation\">.<\/span>strftime<span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;%H:%M:%S&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">}<\/span><\/span><span class=\"token string\">&#034;<\/span><\/span><br \/>\n            <span class=\"token keyword\">yield<\/span> ServerSentEvent<span class=\"token punctuation\">(<\/span><br \/>\n                data<span class=\"token operator\">&#061;<\/span>msg<span class=\"token punctuation\">,<\/span><br \/>\n                event<span class=\"token operator\">&#061;<\/span><span class=\"token string\">&#034;update&#034;<\/span><span class=\"token punctuation\">,<\/span><br \/>\n                <span class=\"token builtin\">id<\/span><span class=\"token operator\">&#061;<\/span><span class=\"token builtin\">str<\/span><span class=\"token punctuation\">(<\/span>i<span class=\"token punctuation\">)<\/span><br \/>\n            <span class=\"token punctuation\">)<\/span><br \/>\n            <span class=\"token keyword\">await<\/span> asyncio<span class=\"token punctuation\">.<\/span>sleep<span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p>    <span class=\"token keyword\">return<\/span> EventSourceResponse<span class=\"token punctuation\">(<\/span>event_generator<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> ping<span class=\"token operator\">&#061;<\/span><span class=\"token number\">5<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p><span class=\"token keyword\">if<\/span> __name__ <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token string\">&#034;__main__&#034;<\/span><span class=\"token punctuation\">:<\/span><br \/>\n    <span class=\"token keyword\">import<\/span> uvicorn<br \/>\n    uvicorn<span class=\"token punctuation\">.<\/span>run<span class=\"token punctuation\">(<\/span>app<span class=\"token punctuation\">,<\/span> host<span class=\"token operator\">&#061;<\/span><span class=\"token string\">&#034;0.0.0.0&#034;<\/span><span class=\"token punctuation\">,<\/span> port<span class=\"token operator\">&#061;<\/span><span class=\"token number\">8000<\/span><span class=\"token punctuation\">,<\/span> log_level<span class=\"token operator\">&#061;<\/span><span class=\"token string\">&#034;info&#034;<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p>\u5ba2\u6237\u7aef JavaScript&#xff1a;<\/p>\n<p><span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>script<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token script\"><span class=\"token language-javascript\"><br \/>\n  <span class=\"token keyword\">const<\/span> source <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">EventSource<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;http:\/\/localhost:8000\/stream&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n  source<span class=\"token punctuation\">.<\/span><span class=\"token function\">addEventListener<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;update&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token parameter\">event<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;&gt;<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    console<span class=\"token punctuation\">.<\/span><span class=\"token function\">log<\/span><span class=\"token punctuation\">(<\/span><span class=\"token template-string\"><span class=\"token template-punctuation string\">&#096;<\/span><span class=\"token string\">ID: <\/span><span class=\"token interpolation\"><span class=\"token interpolation-punctuation punctuation\">${<\/span>event<span class=\"token punctuation\">.<\/span>id<span class=\"token interpolation-punctuation punctuation\">}<\/span><\/span><span class=\"token string\">, Data: <\/span><span class=\"token interpolation\"><span class=\"token interpolation-punctuation punctuation\">${<\/span>event<span class=\"token punctuation\">.<\/span>data<span class=\"token interpolation-punctuation punctuation\">}<\/span><\/span><span class=\"token template-punctuation string\">&#096;<\/span><\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n  <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<\/span><\/span><span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>script<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><\/p>\n<p>\u8f93\u51fa\u793a\u4f8b&#xff08;\u6d4f\u89c8\u5668\u63a7\u5236\u53f0&#xff09;&#xff1a;<\/p>\n<p>ID: 1, Data: Update 1<br \/>\nTime: 12:34:56<br \/>\nID: 2, Data: Update 2<br \/>\nTime: 12:34:57<br \/>\n&#8230;<\/p>\n<p>\u8bf4\u660e&#xff1a;<\/p>\n<ul>\n<li>ServerSentEvent \u652f\u6301 data\u3001event\u3001id \u548c comment \u5b57\u6bb5\u3002<\/li>\n<li>ping&#061;5 \u6bcf 5 \u79d2\u53d1\u9001 ping \u4fdd\u6301\u8fde\u63a5\u3002<\/li>\n<li>\u68c0\u67e5 request.is_disconnected() \u786e\u4fdd\u5ba2\u6237\u7aef\u65ad\u5f00\u65f6\u505c\u6b62\u751f\u6210\u3002<\/li>\n<\/ul>\n<h5>3.3 \u5904\u7406\u5ba2\u6237\u7aef\u65ad\u5f00<\/h5>\n<p>\u4f18\u96c5\u5904\u7406\u5ba2\u6237\u7aef\u5173\u95ed\u8fde\u63a5\u3002<\/p>\n<p><span class=\"token keyword\">from<\/span> fastapi <span class=\"token keyword\">import<\/span> FastAPI<span class=\"token punctuation\">,<\/span> Request<br \/>\n<span class=\"token keyword\">from<\/span> sse_starlette<span class=\"token punctuation\">.<\/span>sse <span class=\"token keyword\">import<\/span> EventSourceResponse<br \/>\n<span class=\"token keyword\">import<\/span> asyncio<br \/>\n<span class=\"token keyword\">import<\/span> logging<\/p>\n<p>app <span class=\"token operator\">&#061;<\/span> FastAPI<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\nlogging<span class=\"token punctuation\">.<\/span>basicConfig<span class=\"token punctuation\">(<\/span>level<span class=\"token operator\">&#061;<\/span>logging<span class=\"token punctuation\">.<\/span>INFO<span class=\"token punctuation\">)<\/span><br \/>\n_log <span class=\"token operator\">&#061;<\/span> logging<span class=\"token punctuation\">.<\/span>getLogger<span class=\"token punctuation\">(<\/span>__name__<span class=\"token punctuation\">)<\/span><\/p>\n<p><span class=\"token decorator annotation punctuation\">&#064;app<span class=\"token punctuation\">.<\/span>get<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\/endless&#034;<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token keyword\">async<\/span> <span class=\"token keyword\">def<\/span> <span class=\"token function\">endless<\/span><span class=\"token punctuation\">(<\/span>req<span class=\"token punctuation\">:<\/span> Request<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">:<\/span><br \/>\n    <span class=\"token keyword\">async<\/span> <span class=\"token keyword\">def<\/span> <span class=\"token function\">event_publisher<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">:<\/span><br \/>\n        i <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><br \/>\n        <span class=\"token keyword\">try<\/span><span class=\"token punctuation\">:<\/span><br \/>\n            <span class=\"token keyword\">while<\/span> <span class=\"token boolean\">True<\/span><span class=\"token punctuation\">:<\/span><br \/>\n                i <span class=\"token operator\">&#043;&#061;<\/span> <span class=\"token number\">1<\/span><br \/>\n                <span class=\"token keyword\">yield<\/span> <span class=\"token builtin\">dict<\/span><span class=\"token punctuation\">(<\/span>data<span class=\"token operator\">&#061;<\/span>i<span class=\"token punctuation\">)<\/span><br \/>\n                <span class=\"token keyword\">await<\/span> asyncio<span class=\"token punctuation\">.<\/span>sleep<span class=\"token punctuation\">(<\/span><span class=\"token number\">0.2<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token keyword\">except<\/span> asyncio<span class=\"token punctuation\">.<\/span>CancelledError <span class=\"token keyword\">as<\/span> e<span class=\"token punctuation\">:<\/span><br \/>\n            _log<span class=\"token punctuation\">.<\/span>info<span class=\"token punctuation\">(<\/span><span class=\"token string-interpolation\"><span class=\"token string\">f&#034;Disconnected from client <\/span><span class=\"token interpolation\"><span class=\"token punctuation\">{<\/span>req<span class=\"token punctuation\">.<\/span>client<span class=\"token punctuation\">}<\/span><\/span><span class=\"token string\">&#034;<\/span><\/span><span class=\"token punctuation\">)<\/span><br \/>\n            <span class=\"token keyword\">raise<\/span> e<\/p>\n<p>    <span class=\"token keyword\">return<\/span> EventSourceResponse<span class=\"token punctuation\">(<\/span>event_publisher<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p><span class=\"token keyword\">if<\/span> __name__ <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token string\">&#034;__main__&#034;<\/span><span class=\"token punctuation\">:<\/span><br \/>\n    <span class=\"token keyword\">import<\/span> uvicorn<br \/>\n    uvicorn<span class=\"token punctuation\">.<\/span>run<span class=\"token punctuation\">(<\/span>app<span class=\"token punctuation\">,<\/span> host<span class=\"token operator\">&#061;<\/span><span class=\"token string\">&#034;0.0.0.0&#034;<\/span><span class=\"token punctuation\">,<\/span> port<span class=\"token operator\">&#061;<\/span><span class=\"token number\">8000<\/span><span class=\"token punctuation\">,<\/span> log_level<span class=\"token operator\">&#061;<\/span><span class=\"token string\">&#034;info&#034;<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p>\u8bf4\u660e&#xff1a;<\/p>\n<ul>\n<li>\u6355\u83b7 asyncio.CancelledError \u5904\u7406\u5ba2\u6237\u7aef\u65ad\u5f00&#xff08;\u5982\u5237\u65b0\u6216\u5173\u95ed\u9875\u9762&#xff09;\u3002<\/li>\n<li>\u4f7f\u7528\u65e5\u5fd7\u8bb0\u5f55\u65ad\u5f00\u4e8b\u4ef6\u3002<\/li>\n<li>anyio.TaskGroups \u786e\u4fdd\u4efb\u52a1\u5b89\u5168\u7ba1\u7406\u3002<\/li>\n<\/ul>\n<h5>3.4 \u5b9a\u5411\u4e8b\u4ef6\u63a8\u9001<\/h5>\n<p>\u5411\u7279\u5b9a\u5ba2\u6237\u7aef\u53d1\u9001\u4e8b\u4ef6\u3002<\/p>\n<p><span class=\"token keyword\">from<\/span> fastapi <span class=\"token keyword\">import<\/span> FastAPI<span class=\"token punctuation\">,<\/span> Request<br \/>\n<span class=\"token keyword\">from<\/span> pydantic <span class=\"token keyword\">import<\/span> BaseModel<br \/>\n<span class=\"token keyword\">from<\/span> sse_starlette<span class=\"token punctuation\">.<\/span>sse <span class=\"token keyword\">import<\/span> EventSourceResponse<br \/>\n<span class=\"token keyword\">from<\/span> collections <span class=\"token keyword\">import<\/span> defaultdict<br \/>\n<span class=\"token keyword\">import<\/span> asyncio<br \/>\n<span class=\"token keyword\">from<\/span> typing <span class=\"token keyword\">import<\/span> Optional<\/p>\n<p>app <span class=\"token operator\">&#061;<\/span> FastAPI<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\nclients <span class=\"token operator\">&#061;<\/span> defaultdict<span class=\"token punctuation\">(<\/span><span class=\"token builtin\">list<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p><span class=\"token keyword\">class<\/span> <span class=\"token class-name\">EmitEventModel<\/span><span class=\"token punctuation\">(<\/span>BaseModel<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">:<\/span><br \/>\n    event_name<span class=\"token punctuation\">:<\/span> <span class=\"token builtin\">str<\/span><br \/>\n    event_data<span class=\"token punctuation\">:<\/span> Optional<span class=\"token punctuation\">[<\/span><span class=\"token builtin\">str<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#034;No Event Data&#034;<\/span><br \/>\n    event_id<span class=\"token punctuation\">:<\/span> Optional<span class=\"token punctuation\">[<\/span><span class=\"token builtin\">int<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token boolean\">None<\/span><br \/>\n    recipient_id<span class=\"token punctuation\">:<\/span> <span class=\"token builtin\">str<\/span><\/p>\n<p><span class=\"token keyword\">async<\/span> <span class=\"token keyword\">def<\/span> <span class=\"token function\">retrieve_events<\/span><span class=\"token punctuation\">(<\/span>recipient_id<span class=\"token punctuation\">:<\/span> <span class=\"token builtin\">str<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">:<\/span><br \/>\n    <span class=\"token keyword\">yield<\/span> <span class=\"token builtin\">dict<\/span><span class=\"token punctuation\">(<\/span>data<span class=\"token operator\">&#061;<\/span><span class=\"token string\">&#034;Connection established&#034;<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token keyword\">while<\/span> <span class=\"token boolean\">True<\/span><span class=\"token punctuation\">:<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> recipient_id <span class=\"token keyword\">in<\/span> clients <span class=\"token keyword\">and<\/span> clients<span class=\"token punctuation\">[<\/span>recipient_id<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">:<\/span><br \/>\n            <span class=\"token keyword\">yield<\/span> clients<span class=\"token punctuation\">[<\/span>recipient_id<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>pop<span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token keyword\">await<\/span> asyncio<span class=\"token punctuation\">.<\/span>sleep<span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p><span class=\"token decorator annotation punctuation\">&#064;app<span class=\"token punctuation\">.<\/span>get<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\/subscribe\/{recipient_id}&#034;<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token keyword\">async<\/span> <span class=\"token keyword\">def<\/span> <span class=\"token function\">loop_back_stream<\/span><span class=\"token punctuation\">(<\/span>req<span class=\"token punctuation\">:<\/span> Request<span class=\"token punctuation\">,<\/span> recipient_id<span class=\"token punctuation\">:<\/span> <span class=\"token builtin\">str<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">:<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> EventSourceResponse<span class=\"token punctuation\">(<\/span>retrieve_events<span class=\"token punctuation\">(<\/span>recipient_id<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p><span class=\"token decorator annotation punctuation\">&#064;app<span class=\"token punctuation\">.<\/span>post<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\/emit&#034;<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token keyword\">async<\/span> <span class=\"token keyword\">def<\/span> <span class=\"token function\">emit_event<\/span><span class=\"token punctuation\">(<\/span>event<span class=\"token punctuation\">:<\/span> EmitEventModel<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">:<\/span><br \/>\n    clients<span class=\"token punctuation\">[<\/span>event<span class=\"token punctuation\">.<\/span>recipient_id<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>append<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token string\">&#034;event&#034;<\/span><span class=\"token punctuation\">:<\/span> event<span class=\"token punctuation\">.<\/span>event_name<span class=\"token punctuation\">,<\/span><br \/>\n        <span class=\"token string\">&#034;data&#034;<\/span><span class=\"token punctuation\">:<\/span> event<span class=\"token punctuation\">.<\/span>event_data<span class=\"token punctuation\">,<\/span><br \/>\n        <span class=\"token string\">&#034;id&#034;<\/span><span class=\"token punctuation\">:<\/span> event<span class=\"token punctuation\">.<\/span>event_id<br \/>\n    <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token punctuation\">{<\/span><span class=\"token string\">&#034;status&#034;<\/span><span class=\"token punctuation\">:<\/span> <span class=\"token string\">&#034;event queued&#034;<\/span><span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token keyword\">if<\/span> __name__ <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token string\">&#034;__main__&#034;<\/span><span class=\"token punctuation\">:<\/span><br \/>\n    <span class=\"token keyword\">import<\/span> uvicorn<br \/>\n    uvicorn<span class=\"token punctuation\">.<\/span>run<span class=\"token punctuation\">(<\/span>app<span class=\"token punctuation\">,<\/span> host<span class=\"token operator\">&#061;<\/span><span class=\"token string\">&#034;0.0.0.0&#034;<\/span><span class=\"token punctuation\">,<\/span> port<span class=\"token operator\">&#061;<\/span><span class=\"token number\">8000<\/span><span class=\"token punctuation\">,<\/span> log_level<span class=\"token operator\">&#061;<\/span><span class=\"token string\">&#034;info&#034;<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p>\u6d4b\u8bd5&#xff1a;<\/p>\n<li>\u8ba2\u9605\u5ba2\u6237\u7aef&#xff1a;<span class=\"token function\">curl<\/span> http:\/\/localhost:8000\/subscribe\/user1\n <\/li>\n<li>\u53d1\u9001\u4e8b\u4ef6&#xff1a;<span class=\"token function\">curl<\/span> -X POST http:\/\/localhost:8000\/emit -H <span class=\"token string\">&#034;Content-Type: application\/json&#034;<\/span> -d <span class=\"token string\">&#039;{&#034;event_name&#034;: &#034;notify&#034;, &#034;event_data&#034;: &#034;Hello user1&#034;, &#034;recipient_id&#034;: &#034;user1&#034;}&#039;<\/span>\n <\/li>\n<p>\u8f93\u51fa\u793a\u4f8b&#xff08;\u5ba2\u6237\u7aef&#xff09;&#xff1a;<\/p>\n<p>data: Connection established<\/p>\n<p>event: notify<br \/>\ndata: Hello user1<\/p>\n<p>\u8bf4\u660e&#xff1a;<\/p>\n<ul>\n<li>\u4f7f\u7528 defaultdict \u5b58\u50a8\u5ba2\u6237\u7aef\u4e8b\u4ef6\u961f\u5217\u3002<\/li>\n<li>\/subscribe\/{recipient_id} \u8ba2\u9605\u4e8b\u4ef6\u6d41\u3002<\/li>\n<li>\/emit \u5411\u6307\u5b9a recipient_id \u63a8\u9001\u4e8b\u4ef6\u3002<\/li>\n<li>\u57fa\u4e8e Stack Overflow \u793a\u4f8b\u6539\u8fdb\u3002<\/li>\n<\/ul>\n<h5>3.5 \u6d4b\u8bd5 SSE \u7aef\u70b9<\/h5>\n<p>\u4f7f\u7528 httpx \u548c httpx_sse \u6d4b\u8bd5 SSE\u3002<\/p>\n<p><span class=\"token keyword\">import<\/span> asyncio<br \/>\n<span class=\"token keyword\">import<\/span> httpx<br \/>\n<span class=\"token keyword\">from<\/span> httpx_sse <span class=\"token keyword\">import<\/span> aconnect_sse<br \/>\n<span class=\"token keyword\">from<\/span> sse_starlette<span class=\"token punctuation\">.<\/span>sse <span class=\"token keyword\">import<\/span> EventSourceResponse<br \/>\n<span class=\"token keyword\">from<\/span> starlette<span class=\"token punctuation\">.<\/span>applications <span class=\"token keyword\">import<\/span> Starlette<br \/>\n<span class=\"token keyword\">from<\/span> starlette<span class=\"token punctuation\">.<\/span>routing <span class=\"token keyword\">import<\/span> Route<\/p>\n<p><span class=\"token keyword\">async<\/span> <span class=\"token keyword\">def<\/span> <span class=\"token function\">auth_events<\/span><span class=\"token punctuation\">(<\/span>request<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">:<\/span><br \/>\n    <span class=\"token keyword\">async<\/span> <span class=\"token keyword\">def<\/span> <span class=\"token function\">events<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">:<\/span><br \/>\n        <span class=\"token keyword\">yield<\/span> <span class=\"token punctuation\">{<\/span><span class=\"token string\">&#034;event&#034;<\/span><span class=\"token punctuation\">:<\/span> <span class=\"token string\">&#034;login&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;data&#034;<\/span><span class=\"token punctuation\">:<\/span> <span class=\"token string\">&#039;{&#034;user_id&#034;: &#034;4135&#034;}&#039;<\/span><span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> EventSourceResponse<span class=\"token punctuation\">(<\/span>events<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p>app <span class=\"token operator\">&#061;<\/span> Starlette<span class=\"token punctuation\">(<\/span>routes<span class=\"token operator\">&#061;<\/span><span class=\"token punctuation\">[<\/span>Route<span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\/sse\/auth\/&#034;<\/span><span class=\"token punctuation\">,<\/span> endpoint<span class=\"token operator\">&#061;<\/span>auth_events<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p><span class=\"token keyword\">async<\/span> <span class=\"token keyword\">def<\/span> <span class=\"token function\">test_sse<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">:<\/span><br \/>\n    <span class=\"token keyword\">async<\/span> <span class=\"token keyword\">with<\/span> httpx<span class=\"token punctuation\">.<\/span>AsyncClient<span class=\"token punctuation\">(<\/span>app<span class=\"token operator\">&#061;<\/span>app<span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">as<\/span> client<span class=\"token punctuation\">:<\/span><br \/>\n        <span class=\"token keyword\">async<\/span> <span class=\"token keyword\">with<\/span> aconnect_sse<span class=\"token punctuation\">(<\/span>client<span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;GET&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;http:\/\/localhost:8000\/sse\/auth\/&#034;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">as<\/span> event_source<span class=\"token punctuation\">:<\/span><br \/>\n            events <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">[<\/span>sse <span class=\"token keyword\">async<\/span> <span class=\"token keyword\">for<\/span> sse <span class=\"token keyword\">in<\/span> event_source<span class=\"token punctuation\">.<\/span>aiter_sse<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">]<\/span><br \/>\n            <span class=\"token punctuation\">(<\/span>sse<span class=\"token punctuation\">,<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;<\/span> events<br \/>\n            <span class=\"token keyword\">assert<\/span> sse<span class=\"token punctuation\">.<\/span>event <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token string\">&#034;login&#034;<\/span><br \/>\n            <span class=\"token keyword\">assert<\/span> sse<span class=\"token punctuation\">.<\/span>json<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token punctuation\">{<\/span><span class=\"token string\">&#034;user_id&#034;<\/span><span class=\"token punctuation\">:<\/span> <span class=\"token string\">&#034;4135&#034;<\/span><span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token keyword\">if<\/span> __name__ <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token string\">&#034;__main__&#034;<\/span><span class=\"token punctuation\">:<\/span><br \/>\n    asyncio<span class=\"token punctuation\">.<\/span>run<span class=\"token punctuation\">(<\/span>test_sse<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p>\u8bf4\u660e&#xff1a;<\/p>\n<ul>\n<li>\u4f7f\u7528 httpx_sse \u7684 aconnect_sse \u6d4b\u8bd5 SSE \u7aef\u70b9\u3002<\/li>\n<li>\u9a8c\u8bc1\u4e8b\u4ef6\u540d\u79f0\u548c\u6570\u636e\u3002<\/li>\n<li>\u9700\u5b89\u88c5 httpx-sse&#xff1a;pip <span class=\"token function\">install<\/span> httpx-sse\n <\/li>\n<\/ul>\n<hr \/>\n<h4>4. \u6027\u80fd\u4e0e\u7279\u70b9<\/h4>\n<ul>\n<li>\u9ad8\u6548\u6027&#xff1a;\u57fa\u4e8e anyio.TaskGroups&#xff0c;\u652f\u6301\u9ad8\u5e76\u53d1 SSE \u8fde\u63a5\u3002<\/li>\n<li>\u6613\u7528\u6027&#xff1a;EventSourceResponse \u5c01\u88c5 SSE \u534f\u8bae&#xff0c;\u7b80\u5316\u5f00\u53d1\u3002<\/li>\n<li>\u517c\u5bb9\u6027&#xff1a;\u4e0e FastAPI\u3001Starlette \u548c uvicorn \u65e0\u7f1d\u96c6\u6210\u3002<\/li>\n<li>\u5c40\u9650\u6027&#xff1a;\n<ul>\n<li>\u4e0d\u652f\u6301 GZipMiddleware&#xff0c;\u53ef\u80fd\u5bfc\u81f4\u538b\u7f29\u51b2\u7a81\u3002<\/li>\n<li>\u975e\u7ebf\u7a0b\u5b89\u5168\u5bf9\u8c61&#xff08;\u5982 SQLAlchemy \u7684 AsyncSession&#xff09;\u9700\u5728\u751f\u6210\u5668\u5185\u521b\u5efa\u3002<\/li>\n<li>\u9700\u624b\u52a8\u6e05\u7406\u4efb\u52a1\u4ee5\u907f\u514d\u5173\u95ed\u65f6\u7684\u8b66\u544a\u3002<\/li>\n<\/ul>\n<\/li>\n<li>\u4e0e\u66ff\u4ee3\u65b9\u6848\u5bf9\u6bd4&#xff1a;\n<ul>\n<li>Starlette StreamingResponse&#xff1a;\u624b\u52a8\u5b9e\u73b0 SSE&#xff0c;\u4ee3\u7801\u590d\u6742&#xff0c;\u7f3a\u4e4f\u534f\u8bae\u652f\u6301\u3002<\/li>\n<li>WebSocket&#xff1a;\u53cc\u5411\u901a\u4fe1&#xff0c;\u9002\u5408\u590d\u6742\u4ea4\u4e92&#xff0c;\u4f46\u5f00\u9500\u8f83\u9ad8\u3002<\/li>\n<li>aiohttp-sse&#xff1a;\u9488\u5bf9 aiohttp \u6846\u67b6&#xff0c;\u4e0d\u9002\u7528 Starlette\/FastAPI\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<hr \/>\n<h4>5. \u5b9e\u9645\u5e94\u7528\u573a\u666f<\/h4>\n<ul>\n<li>\u5b9e\u65f6\u901a\u77e5&#xff1a;\u63a8\u9001\u6d88\u606f\u6216\u8b66\u62a5&#xff08;\u5982\u804a\u5929\u3001\u7cfb\u7edf\u72b6\u6001&#xff09;\u3002<\/li>\n<li>\u6570\u636e\u6d41&#xff1a;\u6d41\u5f0f\u4f20\u8f93\u6570\u636e\u5e93\u66f4\u65b0&#xff08;\u5982 PostgreSQL \u7684 TAIL&#xff09;\u3002<\/li>\n<li>\u4eea\u8868\u76d8&#xff1a;\u5b9e\u65f6\u66f4\u65b0\u56fe\u8868\u6216\u6307\u6807\u3002<\/li>\n<li>\u8fdb\u5ea6\u8ddf\u8e2a&#xff1a;\u5f02\u6b65\u4efb\u52a1\u7684\u72b6\u6001\u66f4\u65b0&#xff08;\u5982\u6587\u4ef6\u4e0a\u4f20\u3001\u540e\u53f0\u5904\u7406&#xff09;\u3002<\/li>\n<li>HTMX \u96c6\u6210&#xff1a;\u7ed3\u5408 HTMX \u7684 hx-sse \u5c5e\u6027\u5b9e\u73b0\u52a8\u6001\u524d\u7aef\u3002<\/li>\n<\/ul>\n<p>\u793a\u4f8b&#xff08;\u6570\u636e\u5e93\u6d41\u5f0f\u66f4\u65b0&#xff09;&#xff1a;<\/p>\n<p><span class=\"token keyword\">from<\/span> fastapi <span class=\"token keyword\">import<\/span> FastAPI<span class=\"token punctuation\">,<\/span> Request<br \/>\n<span class=\"token keyword\">from<\/span> sse_starlette<span class=\"token punctuation\">.<\/span>sse <span class=\"token keyword\">import<\/span> EventSourceResponse<br \/>\n<span class=\"token keyword\">import<\/span> asyncpg<br \/>\n<span class=\"token keyword\">import<\/span> asyncio<br \/>\n<span class=\"token keyword\">from<\/span> loguru <span class=\"token keyword\">import<\/span> logger<\/p>\n<p>app <span class=\"token operator\">&#061;<\/span> FastAPI<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p><span class=\"token keyword\">async<\/span> <span class=\"token keyword\">def<\/span> <span class=\"token function\">get_db_pool<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">:<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token keyword\">await<\/span> asyncpg<span class=\"token punctuation\">.<\/span>create_pool<span class=\"token punctuation\">(<\/span><br \/>\n        user<span class=\"token operator\">&#061;<\/span><span class=\"token string\">&#034;postgres&#034;<\/span><span class=\"token punctuation\">,<\/span> password<span class=\"token operator\">&#061;<\/span><span class=\"token string\">&#034;postgres&#034;<\/span><span class=\"token punctuation\">,<\/span> database<span class=\"token operator\">&#061;<\/span><span class=\"token string\">&#034;todos&#034;<\/span><span class=\"token punctuation\">,<\/span> host<span class=\"token operator\">&#061;<\/span><span class=\"token string\">&#034;localhost&#034;<\/span><br \/>\n    <span class=\"token punctuation\">)<\/span><\/p>\n<p><span class=\"token decorator annotation punctuation\">&#064;app<span class=\"token punctuation\">.<\/span>get<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\/stream&#034;<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token keyword\">async<\/span> <span class=\"token keyword\">def<\/span> <span class=\"token function\">message_stream<\/span><span class=\"token punctuation\">(<\/span>request<span class=\"token punctuation\">:<\/span> Request<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">:<\/span><br \/>\n    pool <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">await<\/span> get_db_pool<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p>    <span class=\"token keyword\">async<\/span> <span class=\"token keyword\">def<\/span> <span class=\"token function\">event_generator<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">:<\/span><br \/>\n        <span class=\"token keyword\">try<\/span><span class=\"token punctuation\">:<\/span><br \/>\n            <span class=\"token keyword\">async<\/span> <span class=\"token keyword\">with<\/span> pool<span class=\"token punctuation\">.<\/span>acquire<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">as<\/span> conn<span class=\"token punctuation\">:<\/span><br \/>\n                <span class=\"token keyword\">async<\/span> <span class=\"token keyword\">with<\/span> conn<span class=\"token punctuation\">.<\/span>transaction<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">:<\/span><br \/>\n                    <span class=\"token keyword\">await<\/span> conn<span class=\"token punctuation\">.<\/span>execute<span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;LISTEN todo_inserted&#034;<\/span><span class=\"token punctuation\">)<\/span><br \/>\n                    <span class=\"token keyword\">async<\/span> <span class=\"token keyword\">for<\/span> notify <span class=\"token keyword\">in<\/span> conn<span class=\"token punctuation\">.<\/span>notifies<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 keyword\">await<\/span> request<span class=\"token punctuation\">.<\/span>is_disconnected<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">:<\/span><br \/>\n                            <span class=\"token keyword\">break<\/span><br \/>\n                        <span class=\"token keyword\">yield<\/span> <span class=\"token punctuation\">{<\/span><span class=\"token string\">&#034;data&#034;<\/span><span class=\"token punctuation\">:<\/span> notify<span class=\"token punctuation\">.<\/span>payload<span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;event&#034;<\/span><span class=\"token punctuation\">:<\/span> <span class=\"token string\">&#034;todo_added&#034;<\/span><span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token keyword\">except<\/span> Exception <span class=\"token keyword\">as<\/span> e<span class=\"token punctuation\">:<\/span><br \/>\n            logger<span class=\"token punctuation\">.<\/span>error<span class=\"token punctuation\">(<\/span><span class=\"token string-interpolation\"><span class=\"token string\">f&#034;Stream error: <\/span><span class=\"token interpolation\"><span class=\"token punctuation\">{<\/span>e<span class=\"token punctuation\">}<\/span><\/span><span class=\"token string\">&#034;<\/span><\/span><span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token keyword\">finally<\/span><span class=\"token punctuation\">:<\/span><br \/>\n            <span class=\"token keyword\">await<\/span> pool<span class=\"token punctuation\">.<\/span>close<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p>    <span class=\"token keyword\">return<\/span> EventSourceResponse<span class=\"token punctuation\">(<\/span>event_generator<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> ping<span class=\"token operator\">&#061;<\/span><span class=\"token number\">10<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p><span class=\"token keyword\">if<\/span> __name__ <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token string\">&#034;__main__&#034;<\/span><span class=\"token punctuation\">:<\/span><br \/>\n    logger<span class=\"token punctuation\">.<\/span>add<span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;app.log&#034;<\/span><span class=\"token punctuation\">,<\/span> rotation<span class=\"token operator\">&#061;<\/span><span class=\"token string\">&#034;1 MB&#034;<\/span><span class=\"token punctuation\">,<\/span> level<span class=\"token operator\">&#061;<\/span><span class=\"token string\">&#034;INFO&#034;<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token keyword\">import<\/span> uvicorn<br \/>\n    uvicorn<span class=\"token punctuation\">.<\/span>run<span class=\"token punctuation\">(<\/span>app<span class=\"token punctuation\">,<\/span> host<span class=\"token operator\">&#061;<\/span><span class=\"token string\">&#034;0.0.0.0&#034;<\/span><span class=\"token punctuation\">,<\/span> port<span class=\"token operator\">&#061;<\/span><span class=\"token number\">8000<\/span><span class=\"token punctuation\">,<\/span> log_level<span class=\"token operator\">&#061;<\/span><span class=\"token string\">&#034;info&#034;<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p>\u8fd0\u884c\u73af\u5883&#xff1a;<\/p>\n<ul>\n<li>\u5b89\u88c5 asyncpg&#xff1a;pip <span class=\"token function\">install<\/span> asyncpg\n <\/li>\n<li>\u786e\u4fdd PostgreSQL \u8fd0\u884c\u5e76\u521b\u5efa todos \u6570\u636e\u5e93\u3002<\/li>\n<\/ul>\n<p>\u8bf4\u660e&#xff1a;<\/p>\n<ul>\n<li>\u76d1\u542c PostgreSQL \u7684 todo_inserted \u901a\u9053\u3002<\/li>\n<li>\u4f7f\u7528 asyncpg \u63a5\u6536\u901a\u77e5\u5e76\u901a\u8fc7 SSE \u63a8\u9001\u3002<\/li>\n<li>loguru \u8bb0\u5f55\u9519\u8bef\u3002<\/li>\n<li>\u57fa\u4e8e bunny.net \u793a\u4f8b\u3002<\/li>\n<\/ul>\n<hr \/>\n<h4>6. \u6ce8\u610f\u4e8b\u9879<\/h4>\n<ul>\n<li>GZipMiddleware \u51b2\u7a81&#xff1a;\n<ul>\n<li>SSE \u4e0d\u517c\u5bb9 GZipMiddleware&#xff0c;\u9700\u7981\u7528&#xff1a;app <span class=\"token operator\">&#061;<\/span> Starlette<span class=\"token punctuation\">(<\/span>middleware<span class=\"token operator\">&#061;<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span>  <span class=\"token comment\"># \u79fb\u9664 GZipMiddleware<\/span>\n <\/li>\n<li>\u5426\u5219\u53ef\u80fd\u5bfc\u81f4\u6d41\u5f0f\u4f20\u8f93\u5931\u8d25\u3002<\/li>\n<\/ul>\n<\/li>\n<li>\u975e\u7ebf\u7a0b\u5b89\u5168\u5bf9\u8c61&#xff1a;\n<ul>\n<li>\u907f\u514d\u5728\u751f\u6210\u5668\u5916\u521b\u5efa\u6570\u636e\u5e93\u4f1a\u8bdd&#xff08;\u5982 AsyncSession&#xff09;&#xff1a;<span class=\"token comment\"># \u274c \u9519\u8bef<\/span><br \/>\n<span class=\"token keyword\">async<\/span> <span class=\"token keyword\">def<\/span> <span class=\"token function\">bad_route<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">:<\/span><br \/>\n    <span class=\"token keyword\">async<\/span> <span class=\"token keyword\">with<\/span> AsyncSession<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">as<\/span> session<span class=\"token punctuation\">:<\/span><br \/>\n        <span class=\"token keyword\">async<\/span> <span class=\"token keyword\">def<\/span> <span class=\"token function\">generator<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">:<\/span><br \/>\n            <span class=\"token keyword\">async<\/span> <span class=\"token keyword\">for<\/span> row <span class=\"token keyword\">in<\/span> session<span class=\"token punctuation\">.<\/span>execute<span class=\"token punctuation\">(<\/span>select<span class=\"token punctuation\">(<\/span>User<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">:<\/span><br \/>\n                <span class=\"token keyword\">yield<\/span> <span class=\"token builtin\">dict<\/span><span class=\"token punctuation\">(<\/span>data<span class=\"token operator\">&#061;<\/span>row<span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> EventSourceResponse<span class=\"token punctuation\">(<\/span>generator<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p><span class=\"token comment\"># \u2705 \u6b63\u786e<\/span><br \/>\n<span class=\"token keyword\">async<\/span> <span class=\"token keyword\">def<\/span> <span class=\"token function\">good_route<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">:<\/span><br \/>\n    <span class=\"token keyword\">async<\/span> <span class=\"token keyword\">def<\/span> <span class=\"token function\">generator<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">:<\/span><br \/>\n        <span class=\"token keyword\">async<\/span> <span class=\"token keyword\">with<\/span> AsyncSession<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">as<\/span> session<span class=\"token punctuation\">:<\/span><br \/>\n            <span class=\"token keyword\">async<\/span> <span class=\"token keyword\">for<\/span> row <span class=\"token keyword\">in<\/span> session<span class=\"token punctuation\">.<\/span>execute<span class=\"token punctuation\">(<\/span>select<span class=\"token punctuation\">(<\/span>User<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">:<\/span><br \/>\n                <span class=\"token keyword\">yield<\/span> <span class=\"token builtin\">dict<\/span><span class=\"token punctuation\">(<\/span>data<span class=\"token operator\">&#061;<\/span>row<span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> EventSourceResponse<span class=\"token punctuation\">(<\/span>generator<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span>\n <\/li>\n<li>\u786e\u4fdd\u4f1a\u8bdd\u5728\u751f\u6210\u5668\u5185\u7ba1\u7406\u3002<\/li>\n<\/ul>\n<\/li>\n<li>\u670d\u52a1\u5668\u5173\u95ed&#xff1a;\n<ul>\n<li>\u505c\u6b62\u6240\u6709\u751f\u6210\u5668\u4efb\u52a1\u4ee5\u907f\u514d\u8b66\u544a&#xff1a;<span class=\"token keyword\">from<\/span> sse_starlette<span class=\"token punctuation\">.<\/span>sse <span class=\"token keyword\">import<\/span> AppStatus<br \/>\nAppStatus<span class=\"token punctuation\">.<\/span>should_exit_event <span class=\"token operator\">&#061;<\/span> <span class=\"token boolean\">None<\/span>\n <\/li>\n<li>\u5c24\u5176\u5728\u6d4b\u8bd5\u591a SSE \u7aef\u70b9\u65f6&#xff08;Issue #59&#xff09;\u3002<\/li>\n<\/ul>\n<\/li>\n<li>\u5ba2\u6237\u7aef\u65ad\u5f00&#xff1a;\n<ul>\n<li>\u4f7f\u7528 request.is_disconnected() \u68c0\u67e5\u5ba2\u6237\u7aef\u72b6\u6001\u3002<\/li>\n<li>\u6355\u83b7 asyncio.CancelledError \u6e05\u7406\u8d44\u6e90\u3002<\/li>\n<\/ul>\n<\/li>\n<li>\u6d4b\u8bd5\u95ee\u9898&#xff1a;\n<ul>\n<li>\u591a SSE \u7aef\u70b9\u6d4b\u8bd5\u53ef\u80fd\u5f15\u53d1 RuntimeError&#xff08;\u4e8b\u4ef6\u5faa\u73af\u7ed1\u5b9a&#xff09;&#xff0c;\u4f7f\u7528 pytest \u5939\u5177\u4fee\u590d&#xff1a;<span class=\"token decorator annotation punctuation\">&#064;pytest<span class=\"token punctuation\">.<\/span>fixture<\/span><br \/>\n<span class=\"token keyword\">def<\/span> <span class=\"token function\">reset_sse_starlette_appstatus_event<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">:<\/span><br \/>\n    <span class=\"token keyword\">from<\/span> sse_starlette<span class=\"token punctuation\">.<\/span>sse <span class=\"token keyword\">import<\/span> AppStatus<br \/>\n    AppStatus<span class=\"token punctuation\">.<\/span>should_exit_event <span class=\"token operator\">&#061;<\/span> <span class=\"token boolean\">None<\/span>\n <\/li>\n<li>\u53c2\u8003 Issue #59\u3002<\/li>\n<\/ul>\n<\/li>\n<li>\u6d4f\u89c8\u5668\u9650\u5236&#xff1a;\n<ul>\n<li>\u6d4f\u89c8\u5668\u5bf9\u540c\u4e00\u57df\u540d SSE \u8fde\u63a5\u6570\u6709\u9650&#xff08;\u901a\u5e38 6 \u4e2a&#xff09;&#xff0c;\u9700\u9ad8\u6548\u7ba1\u7406\u8fde\u63a5\u3002<\/li>\n<li>\u786e\u4fdd\u8fde\u63a5\u6b63\u786e\u5173\u95ed&#xff08;\u8fd4\u56de HTTP 204 \u6216\u663e\u5f0f\u5173\u95ed&#xff09;\u3002<\/li>\n<\/ul>\n<\/li>\n<li>\u751f\u4ea7\u90e8\u7f72&#xff1a;\n<ul>\n<li>\u4f7f\u7528 uvicorn \u7684 monkeypatch \u4f18\u5316\u4fe1\u53f7\u5904\u7406&#xff1a;<span class=\"token keyword\">import<\/span> uvicorn<br \/>\nuvicorn<span class=\"token punctuation\">.<\/span>run<span class=\"token punctuation\">(<\/span>app<span class=\"token punctuation\">,<\/span> host<span class=\"token operator\">&#061;<\/span><span class=\"token string\">&#034;0.0.0.0&#034;<\/span><span class=\"token punctuation\">,<\/span> port<span class=\"token operator\">&#061;<\/span><span class=\"token number\">8000<\/span><span class=\"token punctuation\">,<\/span> loop<span class=\"token operator\">&#061;<\/span><span class=\"token string\">&#034;uvloop&#034;<\/span><span class=\"token punctuation\">)<\/span>\n <\/li>\n<li>\u914d\u5408 Nginx \u7981\u7528\u7f13\u51b2&#xff1a;proxy_buffering off;<br \/>\nproxy_cache off;\n <\/li>\n<li>\u53c2\u8003 Stack Overflow \u89e3\u51b3\u65b9\u6848\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<hr \/>\n<h4>7. \u8d44\u6e90\u4e0e\u6587\u6863<\/h4>\n<ul>\n<li>\u5b98\u65b9\u6587\u6863&#xff1a;https:\/\/github.com\/sysid\/sse-starlette<\/li>\n<li>PyPI \u9875\u9762&#xff1a;https:\/\/pypi.org\/project\/sse-starlette\/<\/li>\n<li>\u76f8\u5173\u6559\u7a0b&#xff1a;\n<ul>\n<li>FastAPI SSE \u6307\u5357&#xff1a;https:\/\/devdojo.com\/bobbyiliev\/how-to-use-server-sent-events-sse-with-fastapi <\/li>\n<li>Bunny.net SSE \u793a\u4f8b&#xff1a;https:\/\/bunny.net\/blog\/what-is-sse-server-sent-events-and-how-do-they-work\/ <\/li>\n<\/ul>\n<\/li>\n<li>\u793e\u533a&#xff1a;\n<ul>\n<li>Stack Overflow&#xff08;sse-starlette \u6807\u7b7e&#xff09;&#xff1a;https:\/\/stackoverflow.com\/questions\/tagged\/sse-starlette<\/li>\n<li>GitHub Issues&#xff1a;https:\/\/github.com\/sysid\/sse-starlette\/issues<\/li>\n<\/ul>\n<\/li>\n<li>\u80cc\u666f\u8d44\u6599&#xff1a;\n<ul>\n<li>SSE \u534f\u8bae&#xff1a;https:\/\/sysid.github.io\/server-sent-events\/ <\/li>\n<li>Starlette \u6587\u6863&#xff1a;https:\/\/www.starlette.io\/<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>\u6587\u7ae0\u6d4f\u89c8\u9605\u8bfb969\u6b21\uff0c\u70b9\u8d5e27\u6b21\uff0c\u6536\u85cf18\u6b21\u3002sse_starlette \u662f\u4e00\u4e2a Python \u5e93\uff0c\u4e3a Starlette \u548c FastAPI \u6846\u67b6\u63d0\u4f9b\u5bf9 Server-Sent Events\uff08SSE\uff0c\u670d\u52a1\u5668\u63a8\u9001\u4e8b\u4ef6\uff09\u7684\u652f\u6301\u3002\u5b83\u901a\u8fc7 EventSourceResponse \u7c7b\u5b9e\u73b0 SSE \u534f\u8bae\uff0c\u5141\u8bb8\u670d\u52a1\u5668\u5f02\u6b65\u5411\u5ba2\u6237\u7aef\u63a8\u9001\u5b9e\u65f6\u6570\u636e\uff0c\u9002\u5408\u6784\u5efa\u5b9e\u65f6 Web \u5e94\u7528\uff0c\u5982\u901a\u77e5\u7cfb\u7edf\u3001\u5b9e\u65f6\u4eea\u8868\u76d8\u6216\u6d41\u5f0f\u6570\u636e\u66f4\u65b0\u3002sse_starlette \u8f7b\u91cf\u4e14\u4e0e ASGI 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