{"id":115687,"date":"2026-10-13T07:33:06","date_gmt":"2026-10-12T23:33:06","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/115687.html"},"modified":"2026-10-13T07:33:06","modified_gmt":"2026-10-12T23:33:06","slug":"dns-%e8%a7%a3%e6%9e%90%e5%88%b0%e5%ba%95%e6%85%a2%e5%9c%a8%e5%93%aa%ef%bc%9f%e7%bc%93%e5%ad%98%e3%80%81%e8%b6%85%e6%97%b6%e5%92%8c%e9%87%8d%e8%af%95%e7%9a%84%e5%8f%96%e8%88%8d","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/115687.html","title":{"rendered":"DNS \u89e3\u6790\u5230\u5e95\u6162\u5728\u54ea\uff1f\u7f13\u5b58\u3001\u8d85\u65f6\u548c\u91cd\u8bd5\u7684\u53d6\u820d"},"content":{"rendered":"<h2>DNS \u89e3\u6790\u5230\u5e95\u6162\u5728\u54ea&#xff1f;\u7f13\u5b58\u3001\u8d85\u65f6\u548c\u91cd\u8bd5\u7684\u53d6\u820d<\/h2>\n<p>\u8fde\u63a5\u6c60\u914d\u597d\u4e86&#xff0c;\u5e76\u53d1\u4e5f\u4e0a\u4e86&#xff0c;\u534f\u7a0b\u5199\u5f97\u6f02\u6f02\u4eae\u4eae&#xff0c;\u4e00\u538b\u6d4b\u2014\u2014\u8fd8\u662f\u6162\u3002\u7ffb\u65e5\u5fd7\u3001\u770b\u8017\u65f6&#xff0c;\u6700\u540e\u53d1\u73b0\u65f6\u95f4\u538b\u6839\u6ca1\u82b1\u5728\u8bf7\u6c42\u4e0a&#xff0c;\u800c\u662f\u5361\u5728\u8bf7\u6c42\u4e4b\u524d\u90a3\u4e00\u6b65&#xff1a;\u628a\u57df\u540d\u7ffb\u6210\u5730\u5740\u3002<\/p>\n<p>\u8fd9\u4e00\u6b65\u5e73\u65f6\u5c31\u51e0\u5341\u6beb\u79d2&#xff0c;\u5b58\u5728\u611f\u4f4e\u5f97\u53ef\u601c&#xff0c;\u53ef\u91cf\u4e00\u5927&#xff0c;\u5b83\u5c31\u6210\u4e86\u90a3\u4e2a\u8eb2\u5728\u89d2\u843d\u62d6\u540e\u817f\u7684\u5bb6\u4f19\u3002\u6211\u8e29\u8fc7\u4e0d\u6b62\u4e00\u6b21&#xff0c;\u8fd9\u7bc7\u628a\u8fd9\u6761\u8def\u4e0a\u5e38\u89c1\u7684\u5751\u62c6\u5f00\u8bb2\u3002<\/p>\n<h3>\u4e00\u3001\u4e3a\u4ec0\u4e48\u5b83\u603b\u88ab\u5ffd\u7565<\/h3>\n<p>\u56e0\u4e3a\u5355\u770b\u4e00\u6b21&#xff0c;\u5b83\u5b9e\u5728\u592a\u4e0d\u8d77\u773c\u3002\u4e00\u6b21\u89e3\u6790\u51e0\u6beb\u79d2\u5230\u51e0\u5341\u6beb\u79d2&#xff0c;\u8ddf\u4e00\u6b21\u5b8c\u6574\u8bf7\u6c42\u51e0\u767e\u6beb\u79d2\u6bd4&#xff0c;\u8c01\u4f1a\u5728\u610f\u3002<\/p>\n<p>\u95ee\u9898\u51fa\u5728\u5b83\u4f1a\u91cd\u590d\u3002\u5047\u8bbe\u4e00\u4e2a\u4efb\u52a1\u8981\u53d1\u4e00\u5343\u6b21\u8bf7\u6c42&#xff0c;\u6bcf\u6b21\u90fd\u91cd\u65b0\u89e3\u6790\u4e00\u904d&#xff0c;\u4e00\u6b21\u7b97\u5b83\u4e8c\u5341\u6beb\u79d2&#xff0c;\u5149\u89e3\u6790\u5c31\u767d\u6254\u6389\u4e8c\u5341\u79d2\u3002\u8981\u662f\u6b63\u597d\u8d76\u4e0a\u89e3\u6790\u6296\u52a8\u7684\u65f6\u6bb5&#xff0c;\u5355\u4e2a\u62d6\u5230\u4e00\u4e24\u79d2&#xff0c;\u4f60\u7684\u8d85\u65f6\u76f4\u63a5\u88ab\u649e\u7206\u3002<\/p>\n<p>\u66f4\u618b\u5c48\u7684\u662f&#xff0c;\u9ed8\u8ba4\u8fd9\u6761\u8def\u4e0a&#xff0c;\u5e94\u7528\u5c42\u51e0\u4e4e\u62ff\u4e0d\u5230\u7f13\u5b58\u3002\u7cfb\u7edf\u8c03\u7528\u628a\u57df\u540d\u7ffb\u6210\u5730\u5740&#xff0c;\u7528\u5b8c\u5c31\u4e22&#xff0c;\u4e0b\u4e00\u6b21\u8bf7\u6c42\u7167\u6837\u4ece\u5934\u8d70\u4e00\u904d\u3002\u5e95\u5c42\u5230\u5e95\u6709\u6ca1\u6709\u7f13\u5b58\u3001\u7f13\u5b58\u591a\u4e45&#xff0c;\u4f60\u8bf4\u4e86\u4e0d\u7b97\u3002<\/p>\n<h3>\u4e8c\u3001\u4e00\u6761\u89e3\u6790\u8bf7\u6c42&#xff0c;\u8d70\u4e86\u54ea\u4e9b\u8def<\/h3>\n<p>\u6309\u987a\u5e8f&#xff0c;\u5927\u6982\u8fd9\u4e48\u51e0\u5c42&#xff1a;<\/p>\n<li>\u5e94\u7528\u81ea\u5df1\u6709\u6ca1\u6709\u7f13\u5b58&#xff08;\u591a\u6570\u9879\u76ee\u6ca1\u6709&#xff09;&#xff1b;<\/li>\n<li>\u7cfb\u7edf hosts \u6587\u4ef6&#xff1b;<\/li>\n<li>\u7cfb\u7edf\u7ea7 DNS \u7f13\u5b58\u6216\u670d\u52a1&#xff08;\u5404\u5e73\u53f0\u4e0d\u4e00\u6837&#xff09;&#xff1b;<\/li>\n<li>\u4f60\u914d\u7f6e\u7684\u90a3\u4e2a\u672c\u5730 DNS \u670d\u52a1\u5668&#xff1b;<\/li>\n<li>\u672c\u5730 DNS \u66ff\u4f60\u53bb\u505a\u9012\u5f52\u67e5\u8be2&#xff0c;\u4e00\u8def\u95ee\u5230\u6839\u3001\u95ee\u5230\u6743\u5a01\u3002<\/li>\n<p>\u73b0\u5b9e\u4e2d\u5e38\u89c1\u7684\u753b\u9762\u662f&#xff1a;\u524d\u9762\u51e0\u5c42\u5168\u6ca1\u547d\u4e2d&#xff0c;\u6bcf\u6b21\u90fd\u8001\u8001\u5b9e\u5b9e\u8d70\u5230\u7b2c 4 \u6b65\u5f80\u540e\u3002\u800c\u8fd9\u51e0\u6b65\u9760\u7684\u90fd\u662f\u7f51\u7edc\u5f80\u8fd4&#xff0c;\u6162\u8d77\u6765\u6ca1\u8fb9\u3002<\/p>\n<p>\u8fd9\u91cc\u6709\u6761\u5206\u754c\u7ebf\u5f97\u5212\u6e05\u695a&#xff1a;\u4f60\u80fd\u52a8\u624b\u7684\u53ea\u6709\u7b2c 1 \u5c42\u3002 \u5e95\u4e0b\u7684\u6539\u4e0d\u52a8&#xff0c;\u90a3\u5c31\u628a\u81ea\u5df1\u8fd9\u4e00\u5c42\u7684\u7f13\u5b58\u6525\u7d27\u3002\u522b\u6307\u671b\u64cd\u4f5c\u7cfb\u7edf\u66ff\u4f60\u515c\u5e95\u3002<\/p>\n<p>\u987a\u5e26\u628a\u7b2c 4\u30015 \u6b65\u8bf4\u900f\u4e00\u70b9\u3002\u672c\u5730 DNS \u670d\u52a1\u5668\u4e0d\u662f\u51ed\u7a7a\u77e5\u9053\u7b54\u6848\u7684&#xff0c;\u5b83\u4f1a\u66ff\u4f60\u4e00\u8def\u5f80\u4e0a\u95ee&#xff1a;\u5148\u95ee\u6839\u670d\u52a1\u5668&#xff0c;\u518d\u95ee\u9876\u7ea7\u57df&#xff0c;\u6700\u540e\u95ee\u5230\u6743\u5a01\u670d\u52a1\u5668&#xff0c;\u62ff\u5230\u7b54\u6848\u540e\u7f13\u5b58\u4e00\u4efd\u518d\u56de\u7ed9\u4f60\u3002\u8fd9\u6761\u94fe\u8def\u53ea\u8981\u6709\u4e00\u6bb5\u6162&#xff0c;\u4f60\u8fd9\u8fb9\u611f\u53d7\u5230\u7684\u5c31\u662f\u89e3\u6790\u6162\u3002<\/p>\n<p>\u8fd8\u6709\u4e2a\u5c11\u6709\u4eba\u63d0\u7684\u70b9&#xff0c;\u53eb\u8d1f\u7f13\u5b58\u3002\u67e5\u4e0d\u5230\u7684\u57df\u540d\u540c\u6837\u4f1a\u88ab\u7f13\u5b58\u4e00\u5c0f\u6bb5\u65f6\u95f4&#xff0c;\u6240\u4ee5\u6709\u65f6\u5019\u4f60\u6539\u5b8c\u89e3\u6790&#xff0c;\u77ed\u65f6\u95f4\u5185\u8fd8\u662f\u5931\u8d25&#xff0c;\u5148\u522b\u6025\u7740\u6000\u7591\u4eba\u751f&#xff0c;\u7b49\u8fc7\u4e86\u90a3\u6bb5\u7f13\u5b58\u65f6\u95f4\u518d\u770b\u3002<\/p>\n<h3>\u4e09\u3001\u6162\u4e0b\u6765\u7684\u51e0\u4e2a\u6765\u6e90<\/h3>\n<p>\u91cd\u590d\u89e3\u6790\u3002 \u540c\u4e00\u4e2a\u57df\u540d\u5728\u4e00\u8f6e\u4efb\u52a1\u91cc\u88ab\u89e3\u6790\u51e0\u5341\u4e0a\u767e\u6b21&#xff0c;\u6bcf\u6b21\u90fd\u5f80\u5916\u8dd1\u4e00\u8d9f&#xff0c;\u6210\u672c\u5168\u843d\u5728\u7b49\u5f85\u4e0a\u3002\u8fd9\u662f\u6700\u666e\u904d\u7684\u4e00\u79cd\u3002<\/p>\n<p>\u89e3\u6790\u8d85\u65f6\u88ab\u5f53\u6210\u8fde\u63a5\u8d85\u65f6\u3002 \u4e0d\u5c11\u4eba\u8bbe\u4e86\u4e2a timeout \u5c31\u89c9\u5f97\u7a33\u59a5\u4e86&#xff0c;\u5176\u5b9e\u90a3\u4e2a\u503c\u7ba1\u7684\u662f\u8fde\u63a5\u548c\u8bfb\u53d6&#xff0c;\u8ddf\u89e3\u6790\u534a\u70b9\u5173\u7cfb\u6ca1\u6709\u3002\u89e3\u6790\u5361\u4f4f\u7684\u65f6\u5019&#xff0c;\u8bf7\u6c42\u4f1a\u505c\u5728&#034;\u8fd8\u6ca1\u53d1\u51fa\u53bb&#034;\u7684\u4f4d\u7f6e&#xff0c;\u62a5\u9519\u4fe1\u606f\u91cc\u751a\u81f3\u770b\u4e0d\u51fa\u8ddf\u89e3\u6790\u6709\u5173&#xff0c;\u7279\u522b\u5bb9\u6613\u67e5\u9519\u65b9\u5411\u3002<\/p>\n<p>\u5931\u8d25\u91cd\u8bd5\u5728\u6084\u6084\u53e0\u52a0\u3002 \u89e3\u6790\u51fa\u95ee\u9898\u65f6&#xff0c;\u5e95\u5c42\u53ef\u80fd\u4f9d\u6b21\u53bb\u8bd5\u597d\u51e0\u4e2a DNS \u670d\u52a1\u5668\u3001\u597d\u51e0\u4e2a\u5730\u5740&#xff0c;\u6bcf\u4e00\u4e2a\u90fd\u8981\u7b49\u4e00\u8f6e\u8d85\u65f6&#xff0c;\u52a0\u8d77\u6765\u7684\u8017\u65f6\u76f8\u5f53\u53ef\u89c2\u3002<\/p>\n<p>\u89e3\u6790\u670d\u52a1\u5668\u7684\u7269\u7406\u8ddd\u79bb\u3002 \u7528\u7684 DNS \u670d\u52a1\u5668\u79bb\u4f60\u5f88\u8fdc&#xff0c;\u6216\u8005\u6743\u5a01\u670d\u52a1\u5668\u54cd\u5e94\u672c\u6765\u5c31\u6162&#xff0c;\u5f80\u8fd4\u65f6\u95f4\u4f1a\u88ab\u653e\u5927\u3002\u8fd9\u79cd\u65f6\u5019\u672c\u5730\u518d\u600e\u4e48\u4f18\u5316\u4e5f\u6709\u9650&#xff0c;\u5f97\u6362\u6210\u8fd1\u4e00\u70b9\u7684\u89e3\u6790\u670d\u52a1\u3002<\/p>\n<p>\u89e3\u6790\u51fa\u591a\u4e2a\u5730\u5740&#xff0c;\u5374\u53ea\u6709\u4e00\u4e2a\u80fd\u7528\u3002 \u8fd9\u79cd\u66f4\u9690\u853d\u3002\u57df\u540d\u89e3\u6790\u56de\u4e86\u597d\u51e0\u4e2a IP&#xff0c;\u5ba2\u6237\u7aef\u4ece\u7b2c\u4e00\u4e2a\u5f00\u59cb\u6328\u4e2a\u8bd5&#xff0c;\u524d\u9762\u51e0\u4e2a\u90fd\u8fde\u4e0d\u4e0a&#xff0c;\u8bd5\u5230\u6700\u540e\u4e00\u4e2a\u624d\u901a\u3002\u8868\u9762\u4e0a\u4e00\u6b21\u5c31\u6210\u4e86&#xff0c;\u5b9e\u9645\u4e0a\u4e00\u534a\u65f6\u95f4\u90fd\u8017\u5728\u65e0\u6548\u7684\u5c1d\u8bd5\u4e0a\u3002<\/p>\n<h3>\u56db\u3001\u80fd\u843d\u5730\u7684\u63d0\u901f\u505a\u6cd5<\/h3>\n<p>\u81ea\u5df1\u52a0\u4e00\u5c42\u7f13\u5b58\u3002 \u8fd9\u662f\u6700\u76f4\u63a5\u4e5f\u6700\u6709\u6548\u7684\u3002\u628a\u89e3\u6790\u7ed3\u679c\u8fde\u540c\u8fc7\u671f\u65f6\u95f4\u5b58\u8d77\u6765&#xff0c;\u547d\u4e2d\u5c31\u4e0d\u95ee\u51fa\u53bb\u3002<\/p>\n<p><span class=\"token keyword\">import<\/span> socket<br \/>\n<span class=\"token keyword\">import<\/span> time<\/p>\n<p>_cache <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">{<\/span><span class=\"token punctuation\">}<\/span>          <span class=\"token comment\"># host -&gt; (\u8fc7\u671f\u65f6\u95f4\u6233, \u89e3\u6790\u7ed3\u679c)<\/span><br \/>\n_TTL <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">300<\/span>           <span class=\"token comment\"># \u7f13\u5b58 5 \u5206\u949f&#xff0c;\u6309\u4e1a\u52a1\u8c03<\/span><\/p>\n<p><span class=\"token keyword\">def<\/span> <span class=\"token function\">cached_getaddrinfo<\/span><span class=\"token punctuation\">(<\/span>host<span class=\"token punctuation\">,<\/span> port<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">*<\/span>args<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">**<\/span>kwargs<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">:<\/span><br \/>\n    now <span class=\"token operator\">&#061;<\/span> time<span class=\"token punctuation\">.<\/span>time<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    hit <span class=\"token operator\">&#061;<\/span> _cache<span class=\"token punctuation\">.<\/span>get<span class=\"token punctuation\">(<\/span>host<span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> hit <span class=\"token keyword\">and<\/span> hit<span class=\"token punctuation\">[<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&gt;<\/span> now<span class=\"token punctuation\">:<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> hit<span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span><br \/>\n    info <span class=\"token operator\">&#061;<\/span> socket<span class=\"token punctuation\">.<\/span>getaddrinfo<span class=\"token punctuation\">(<\/span>host<span class=\"token punctuation\">,<\/span> port<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">*<\/span>args<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">**<\/span>kwargs<span class=\"token punctuation\">)<\/span><br \/>\n    _cache<span class=\"token punctuation\">[<\/span>host<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">(<\/span>now <span class=\"token operator\">&#043;<\/span> _TTL<span class=\"token punctuation\">,<\/span> info<span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> info<\/p>\n<p>TTL \u8fd9\u4e2a\u503c\u5f97\u62ff\u634f&#xff1a;\u592a\u77ed\u7b49\u4e8e\u6ca1\u7f13\u5b58&#xff0c;\u592a\u957f\u5219\u4f1a\u5728\u76ee\u6807\u6362\u4e86\u5730\u5740\u4e4b\u540e&#xff0c;\u4f60\u8fd8\u50bb\u4e4e\u4e4e\u5730\u8fde\u65e7\u5730\u5740\u3002<\/p>\n<p>\u9760\u8fde\u63a5\u590d\u7528\u987a\u624b\u7701\u6389\u89e3\u6790\u3002 \u957f\u8fde\u63a5\u88ab\u590d\u7528\u7684\u65f6\u5019&#xff0c;\u57df\u540d\u65e9\u5c31\u89e3\u6790\u8fc7\u4e86&#xff0c;\u6839\u672c\u4e0d\u4f1a\u518d\u8d70\u4e00\u904d\u3002\u8fd9\u4e5f\u662f\u4e3a\u4ec0\u4e48\u7528\u597d Session\u3001\u522b\u6bcf\u4e2a\u8bf7\u6c42\u90fd\u65b0\u5f00\u8fde\u63a5&#xff0c;\u672c\u8eab\u5c31\u662f\u4e00\u79cd\u63d0\u901f\u3002<\/p>\n<p><span class=\"token keyword\">import<\/span> requests<\/p>\n<p>s <span class=\"token operator\">&#061;<\/span> requests<span class=\"token punctuation\">.<\/span>Session<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token keyword\">for<\/span> url <span class=\"token keyword\">in<\/span> urls<span class=\"token punctuation\">:<\/span><br \/>\n    s<span class=\"token punctuation\">.<\/span>get<span class=\"token punctuation\">(<\/span>url<span class=\"token punctuation\">,<\/span> timeout<span class=\"token operator\">&#061;<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">3<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">10<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span>   <span class=\"token comment\"># \u8fde\u63a5\u88ab\u590d\u7528&#xff0c;\u4e0d\u4f1a\u91cd\u590d\u89e3\u6790<\/span><\/p>\n<p>\u5f3a\u5236\u89e3\u6790\u534f\u8bae&#xff0c;\u8eb2\u5f00 IPv6 \u7684\u5751\u3002 \u6709\u4e9b\u73af\u5883\u91cc&#xff0c;getaddrinfo \u4f1a\u540c\u65f6\u8fd4\u56de IPv4 \u548c IPv6 \u5730\u5740&#xff0c;\u5ba2\u6237\u7aef\u503e\u5411\u4e8e\u5148\u8bd5 IPv6\u3002\u4e07\u4e00\u8fd9\u53f0\u673a\u5668\u7684 IPv6 \u662f&#034;\u80fd\u89e3\u6790\u3001\u8fde\u4e0d\u901a&#034;\u7684\u534a\u540a\u5b50\u72b6\u6001&#xff0c;\u5c31\u4f1a\u53d8\u6210\u6bcf\u6b21\u5148\u7b49 IPv6 \u8d85\u65f6\u3001\u518d\u9000\u56de IPv4&#xff0c;\u767d\u767d\u591a\u8017\u51e0\u79d2\u3002<\/p>\n<p><span class=\"token comment\"># \u660e\u786e\u53ea\u8981 IPv4&#xff0c;\u907f\u514d\u5728 IPv6 \u4e0a\u534a\u6b7b\u4e0d\u6d3b\u5730\u7b49<\/span><br \/>\ninfo <span class=\"token operator\">&#061;<\/span> socket<span class=\"token punctuation\">.<\/span>getaddrinfo<span class=\"token punctuation\">(<\/span>host<span class=\"token punctuation\">,<\/span> port<span class=\"token punctuation\">,<\/span> family<span class=\"token operator\">&#061;<\/span>socket<span class=\"token punctuation\">.<\/span>AF_INET<span class=\"token punctuation\">)<\/span><\/p>\n<p>\u628a\u89e3\u6790\u63d0\u524d&#xff0c;\u632a\u51fa\u70ed\u8def\u5f84\u3002 \u6279\u5904\u7406\u4efb\u52a1\u53ef\u4ee5\u5728\u5f00\u8dd1\u524d&#xff0c;\u628a\u8981\u7528\u7684\u57df\u540d\u4e00\u6b21\u6027\u89e3\u6790\u597d\u3001\u704c\u8fdb\u7f13\u5b58\u3002\u4efb\u52a1\u771f\u6b63\u8dd1\u8d77\u6765\u65f6&#xff0c;\u547d\u4e2d\u7684\u90fd\u662f\u5185\u5b58\u91cc\u7684\u7ed3\u679c&#xff0c;\u70ed\u8def\u5f84\u4e0a\u5c31\u4e0d\u4f1a\u5361\u8fd9\u4e00\u4e0b\u3002<\/p>\n<p>\u7ed9\u7f13\u5b58\u52a0\u4e2a\u9501&#xff0c;\u9632\u7f13\u5b58\u51fb\u7a7f\u3002 \u9ad8\u5e76\u53d1\u4e0b&#xff0c;\u540c\u4e00\u4e2a\u57df\u540d\u7684\u7f13\u5b58\u521a\u8fc7\u671f&#xff0c;\u51e0\u5341\u4e2a\u7ebf\u7a0b\u4f1a\u540c\u65f6\u53d1\u73b0&#034;\u6ca1\u7f13\u5b58&#034;&#xff0c;\u7136\u540e\u4e00\u8d77\u53bb\u89e3\u6790&#xff0c;\u7b49\u4e8e\u628a\u4e00\u6b21\u8bf7\u6c42\u653e\u5927\u6210\u51e0\u5341\u6b21\u3002\u52a0\u628a\u9501\u6216\u8005\u7528\u4e2a future \u53bb\u91cd&#xff0c;\u5c31\u80fd\u628a\u8fd9\u7c7b\u91cd\u590d\u6321\u5728\u5916\u9762\u3002<\/p>\n<p><span class=\"token keyword\">import<\/span> threading<br \/>\n_locks <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">{<\/span><span class=\"token punctuation\">}<\/span><br \/>\n_guard <span class=\"token operator\">&#061;<\/span> threading<span class=\"token punctuation\">.<\/span>Lock<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p><span class=\"token keyword\">def<\/span> <span class=\"token function\">locked_getaddrinfo<\/span><span class=\"token punctuation\">(<\/span>host<span class=\"token punctuation\">,<\/span> port<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">:<\/span><br \/>\n    <span class=\"token keyword\">with<\/span> _guard<span class=\"token punctuation\">:<\/span><br \/>\n        lock <span class=\"token operator\">&#061;<\/span> _locks<span class=\"token punctuation\">.<\/span>setdefault<span class=\"token punctuation\">(<\/span>host<span class=\"token punctuation\">,<\/span> threading<span class=\"token punctuation\">.<\/span>Lock<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token keyword\">with<\/span> lock<span class=\"token punctuation\">:<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> cached_getaddrinfo<span class=\"token punctuation\">(<\/span>host<span class=\"token punctuation\">,<\/span> port<span class=\"token punctuation\">)<\/span><\/p>\n<p>\u4f18\u5148\u590d\u7528\u73b0\u6210\u7684\u673a\u5236\u3002 \u4e0d\u5c11 HTTP \u5ba2\u6237\u7aef\u672c\u8eab\u5c31\u5e26\u8fde\u63a5\u6c60\u548c DNS \u7f13\u5b58\u3002\u628a\u8fde\u63a5\u6c60\u5f00\u597d\u3001\u628a\u4f1a\u8bdd\u590d\u7528\u8d77\u6765&#xff0c;\u987a\u624b\u5c31\u80fd\u6321\u6389\u4e00\u5927\u534a\u91cd\u590d\u89e3\u6790\u3002\u4e0e\u5176\u81ea\u5df1\u9020\u4e00\u5957\u89e3\u6790\u7f13\u5b58&#xff0c;\u4e0d\u5982\u5148\u628a\u5ba2\u6237\u7aef\u81ea\u5e26\u7684\u8fd9\u4e9b\u7528\u5230\u4f4d&#xff0c;\u518d\u8003\u8651\u8865\u5e94\u7528\u5c42\u7f13\u5b58\u3002\u987a\u5e8f\u53cd\u4e86&#xff0c;\u5c31\u662f\u91cd\u590d\u52b3\u52a8\u3002<\/p>\n<h3>\u4e94\u3001\u5bb9\u6613\u53cd\u88ab\u806a\u660e\u8bef\u7684\u5751<\/h3>\n<p>\u7f13\u5b58\u6ca1\u6709\u5931\u6548\u673a\u5236&#xff0c;\u7b49\u4e8e\u7ed9\u81ea\u5df1\u57cb\u96f7\u3002\u76ee\u6807\u6362\u4e86\u5730\u5740&#xff0c;\u4f60\u624b\u91cc\u8fd8\u662f\u65e7\u7ed3\u679c&#xff0c;\u8bf7\u6c42\u81ea\u7136\u8fde\u4e0d\u4e0a\u3002\u6240\u4ee5\u7f13\u5b58\u5fc5\u987b\u5e26 TTL&#xff0c;\u800c\u4e14\u8fd9\u4e2a TTL \u6700\u597d\u505a\u6210\u53ef\u914d\u7f6e&#xff0c;\u522b\u5199\u6b7b\u5728\u4ee3\u7801\u91cc\u3002<\/p>\n<p>TTL \u7ed9\u591a\u5c11&#xff0c;\u770b\u573a\u666f\u3002\u76ee\u6807\u5730\u5740\u5f88\u5c11\u53d8\u7684&#xff0c;\u7ed9\u51e0\u5206\u949f\u5230\u5341\u51e0\u5206\u949f\u90fd\u884c&#xff1b;\u5730\u5740\u7ecf\u5e38\u53d8\u7684&#xff0c;\u5b81\u53ef\u77ed\u4e00\u70b9&#xff0c;\u51e0\u79d2\u5230\u51e0\u5341\u79d2&#xff0c;\u727a\u7272\u4e00\u90e8\u5206\u547d\u4e2d\u7387\u6362\u53ca\u65f6\u6027\u3002\u62ff\u4e0d\u51c6\u5c31\u4ece\u4e00\u5206\u949f\u8d77\u6b65&#xff0c;\u89c2\u5bdf\u4e00\u9635\u518d\u8c03\u3002<\/p>\n<p>\u4e5f\u522b\u5728\u89e3\u6790\u4e0a\u641e\u592a\u591a\u82b1\u6d3b\u3002\u89c1\u8fc7\u6709\u4eba\u53e0\u4e86\u4e24\u4e09\u7ea7\u7f13\u5b58\u3001\u53c8\u5957\u4e86\u961f\u5217&#xff0c;\u7ed3\u679c\u67e5\u4e00\u6b21\u6bd4\u4e0d\u7f13\u5b58\u8fd8\u6162\u3002\u7f13\u5b58\u8fd9\u4e1c\u897f\u591f\u7528\u5c31\u884c&#xff0c;\u7b80\u5355\u53ef\u9760\u8fdc\u6bd4\u70ab\u6280\u91cd\u8981\u3002<\/p>\n<p>\u8fd8\u6709\u4e2a\u9ad8\u9891\u64cd\u4f5c\u95ee\u9898&#xff1a;\u6539\u5b8c DNS \u914d\u7f6e\u8bb0\u5f97\u6e05\u7f13\u5b58\u3002 \u5f88\u591a\u4eba\u6362\u4e86 DNS \u670d\u52a1\u5668\u5374\u6ca1\u751f\u6548&#xff0c;\u4e0d\u662f\u914d\u7f6e\u5199\u9519&#xff0c;\u662f\u65e7\u7f13\u5b58\u8fd8\u6ca1\u8fc7\u671f&#xff0c;\u767d\u6298\u817e\u534a\u5929\u3002<\/p>\n<h3>\u516d\u3001\u600e\u4e48\u786e\u8ba4\u6162\u771f\u7684\u51fa\u5728\u89e3\u6790<\/h3>\n<p>\u522b\u51ed\u611f\u89c9\u3002\u628a\u89e3\u6790\u8fd9\u4e00\u6b65\u5355\u72ec\u62ce\u51fa\u6765\u8ba1\u65f6\u5c31\u884c&#xff1a;<\/p>\n<p><span class=\"token keyword\">import<\/span> socket<br \/>\n<span class=\"token keyword\">import<\/span> time<\/p>\n<p><span class=\"token keyword\">def<\/span> <span class=\"token function\">timed_resolve<\/span><span class=\"token punctuation\">(<\/span>host<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">:<\/span><br \/>\n    t <span class=\"token operator\">&#061;<\/span> time<span class=\"token punctuation\">.<\/span>perf_counter<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    socket<span class=\"token punctuation\">.<\/span>getaddrinfo<span class=\"token punctuation\">(<\/span>host<span class=\"token punctuation\">,<\/span> <span class=\"token number\">80<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token punctuation\">(<\/span>time<span class=\"token punctuation\">.<\/span>perf_counter<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#8211;<\/span> t<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">*<\/span> <span class=\"token number\">1000<\/span>   <span class=\"token comment\"># \u6beb\u79d2<\/span><\/p>\n<p><span class=\"token keyword\">for<\/span> _ <span class=\"token keyword\">in<\/span> <span class=\"token builtin\">range<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">5<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">:<\/span><br \/>\n    <span class=\"token keyword\">print<\/span><span class=\"token punctuation\">(<\/span><span class=\"token builtin\">round<\/span><span class=\"token punctuation\">(<\/span>timed_resolve<span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;example.com&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;ms&#034;<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p>\u7b2c\u4e00\u6b21\u901a\u5e38\u4f1a\u6162&#xff0c;\u540e\u9762\u56e0\u4e3a\u7cfb\u7edf\u7f13\u5b58\u4f1a\u5feb\u4e00\u4e9b&#xff0c;\u8fd9\u5f88\u6b63\u5e38\u3002\u591a\u8dd1\u51e0\u8f6e&#xff0c;\u518d\u6362\u51e0\u4e2a\u57df\u540d\u5bf9\u6bd4&#xff0c;\u5c31\u80fd\u770b\u51fa\u662f\u666e\u904d\u6162&#xff0c;\u8fd8\u662f\u53ea\u6709\u67d0\u4e2a\u57df\u540d\u6162\u3002\u8981\u662f\u6bcf\u6b21\u7a33\u5b9a\u90fd\u5728\u51e0\u767e\u6beb\u79d2\u4ee5\u4e0a&#xff0c;\u90a3\u57fa\u672c\u80fd\u786e\u5b9a\u89e3\u6790\u5c31\u662f\u74f6\u9888&#xff0c;\u524d\u9762\u90a3\u4e9b\u7f13\u5b58\u548c\u590d\u7528\u7684\u624b\u6bb5&#xff0c;\u8be5\u4e0a\u4e86\u3002<\/p>\n<h3>\u5c0f\u7ed3<\/h3>\n<p>DNS \u8fd9\u6761\u8def&#xff0c;\u63d0\u901f\u7684\u6838\u5fc3\u5c31\u4fe9\u5b57\u2014\u2014\u5c11\u8dd1\u3002\u80fd\u7f13\u5b58\u7684\u522b\u91cd\u590d\u95ee&#xff0c;\u80fd\u590d\u7528\u7684\u8fde\u63a5\u522b\u91cd\u5f00\u3002<\/p>\n<p>\u81f3\u4e8e\u6162\u4e86\u600e\u4e48\u5b9a\u4f4d&#xff0c;\u662f\u7f13\u5b58\u6ca1\u547d\u4e2d\u3001\u8d85\u65f6\u6ca1\u8bbe\u5bf9&#xff0c;\u8fd8\u662f\u6389\u8fdb\u4e86 IPv6 \u7684\u5751&#xff0c;\u8fd9\u5957\u6392\u67e5\u987a\u5e8f\u6211\u5199\u5728\u4e0b\u4e00\u7bc7&#xff0c;\u987a\u7740\u8d70\u80fd\u7701\u4e0d\u5c11\u65f6\u95f4\u3002<\/p>\n<hr \/>\n<p>\u4e92\u52a8\u65f6\u95f4&#xff1a;\u4f60\u6709\u6ca1\u6709\u9047\u5230\u8fc7&#034;\u4ee3\u7801\u770b\u7740\u6ca1\u95ee\u9898\u3001\u5c31\u662f\u6162&#034;&#xff0c;\u6700\u540e\u67e5\u5230 DNS \u5934\u4e0a\u7684\u60c5\u51b5&#xff1f;\u8bc4\u8bba\u533a\u8bb2\u8bb2\u5f53\u65f6\u600e\u4e48\u5b9a\u4f4d\u7684 &#x1f447;<\/p>\n<hr 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