{"id":209889,"date":"2025-10-24T00:48:46","date_gmt":"2025-10-23T16:48:46","guid":{"rendered":"https:\/\/www.server.hk\/blog\/209889\/"},"modified":"2025-10-24T00:48:47","modified_gmt":"2025-10-23T16:48:47","slug":"cdn-178","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/209889\/","title":{"rendered":"CDN 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limiting\uff09\u4e0e\u961f\u5217\u7ba1\u7406\u5e2e\u52a9\u5728\u8d85\u5cf0\u671f\u4fdd\u62a4\u540e\u7aef\u670d\u52a1\u4e0d\u88ab\u77ed\u65f6\u95f4\u6d41\u91cf\u6d2a\u5cf0\u51fb\u57ae\u3002<\/li>\n<li><strong>\u534f\u8bae\u5c42\u4e0e\u4f20\u8f93\u4f18\u5316\uff1a<\/strong>\u4f7f\u7528 HTTP\/2\u3001HTTP\/3\uff08\u57fa\u4e8e QUIC\uff09\u53ef\u4ee5\u51cf\u5c11\u8fde\u63a5\u5efa\u7acb\u65f6\u95f4\u4e0e\u5934\u90e8\u5f00\u9500\uff0c\u589e\u5f3a\u5e76\u53d1\u4f20\u8f93\u6027\u80fd\uff1b\u62e5\u585e\u63a7\u5236\u7b97\u6cd5\uff08\u5982 BBR\uff09\u5728\u9ad8\u5e26\u5bbd\u9ad8\u5ef6\u8fdf\u94fe\u8def\u4e2d\u6709\u66f4\u597d\u541e\u5410\u8868\u73b0\u3002<\/li>\n<li><strong>\u5b89\u5168\u9632\u62a4\u4e0e\u5f02\u5e38\u6d41\u91cf\u8bc6\u522b\uff1a<\/strong>\u5e26\u5bbd\u5cf0\u503c\u7ecf\u5e38\u4f34\u968f\u6076\u610f\u653b\u51fb\u3002\u901a\u8fc7\u5b9e\u65f6\u6d41\u91cf\u5206\u6790\u3001Web \u5e94\u7528\u9632\u706b\u5899\uff08WAF\uff09\u3001DDoS \u7f13\u89e3\u4e0e\u884c\u4e3a\u5206\u6790\uff0cCDN \u80fd\u5728\u4e0d\u5f71\u54cd\u6b63\u5e38\u6d41\u91cf\u7684\u60c5\u51b5\u4e0b\u5438\u6536\u6216\u8fc7\u6ee4\u5f02\u5e38\u6d41\u91cf\u3002<\/li>\n<\/ul>\n<h3>\u7f13\u5b58\u7b56\u7565\u4e0e\u56de\u6e90\u8282\u6d41\u7684\u5b9e\u73b0\u7ec6\u8282<\/h3>\n<p>\u63d0\u5347\u7f13\u5b58\u547d\u4e2d\u7387\u662f\u964d\u4f4e\u5cf0\u503c\u56de\u6e90\u5e26\u5bbd\u6700\u76f4\u63a5\u7684\u65b9\u6cd5\u3002\u5e38\u89c1\u505a\u6cd5\u5305\u62ec\uff1a<\/p>\n<ul>\n<li>\u7edf\u4e00\u5e76\u7b80\u5316 Cache Key\uff1a\u907f\u514d\u56e0 URL \u53c2\u6570\u3001\u6392\u5e8f\u6216 sessionID \u5bfc\u81f4\u7f13\u5b58\u788e\u7247\u5316\u3002<\/li>\n<li>\u91c7\u7528\u52a8\u6001\u4e5f\u53ef\u7f13\u5b58\uff08Dynamic Caching\uff09\uff1a\u5bf9\u52a8\u6001\u751f\u6210\u4f46\u77ed\u65f6\u95f4\u5185\u53ef\u91cd\u590d\u4f7f\u7528\u7684\u6570\u636e\u5b9e\u884c\u77ed TTL \u6216 stale \u7b56\u7565\uff0c\u51cf\u5c11\u91cd\u590d\u8ba1\u7b97\u3002<\/li>\n<li>\u9884\u70ed\u7f13\u5b58\uff08Cache Warming\uff09\uff1a\u5728\u9884\u8ba1\u7684\u6d41\u91cf\u9ad8\u5cf0\u524d\u4e3b\u52a8\u62c9\u53d6\u70ed\u70b9\u8d44\u6e90\u5230\u8fb9\u7f18\u8282\u70b9\uff0c\u907f\u514d\u9996\u6b21\u8bf7\u6c42\u5168\u90fd\u6253\u5230\u6e90\u7ad9\u3002<\/li>\n<li>\u5206\u5c42\u7f13\u5b58\uff08Origin Shield \/ Mid-tier Cache\uff09\uff1a\u5efa\u7acb\u4e00\u4e2a\u4e2d\u95f4\u7f13\u5b58\u5c42\u4f5c\u4e3a\u6e90\u7ad9\u4fdd\u62a4\u5c42\uff0c\u96c6\u4e2d\u51cf\u5c11\u591a\u8282\u70b9\u540c\u65f6\u56de\u6e90\u7684\u5e76\u53d1\u538b\u529b\u3002<\/li>\n<\/ul>\n<h2>\u4e0d\u540c\u5e94\u7528\u573a\u666f\u4e0b\u7684\u5cf0\u503c\u5e94\u5bf9<\/h2>\n<p>\u4e0d\u540c\u4e1a\u52a1\u5bf9\u5cf0\u503c\u5904\u7406\u7684\u9700\u6c42\u5b58\u5728\u5dee\u5f02\uff0c\u9488\u5bf9\u6027\u7b56\u7565\u53ef\u5e2e\u52a9\u4f18\u5316\u6210\u672c\u548c\u6027\u80fd\u3002<\/p>\n<h3>\u9759\u6001\u5185\u5bb9\u5206\u53d1\uff08\u56fe\u7247\u3001\u89c6\u9891\u3001\u9759\u6001\u7ad9\u70b9\uff09<\/h3>\n<p>\u9759\u6001\u5185\u5bb9\u6613\u4e8e\u7f13\u5b58\uff0cCDN \u5728\u8fd9\u7c7b\u573a\u666f\u4e2d\u6700\u80fd\u53d1\u6325\u5e26\u5bbd\u524a\u5cf0\u4f5c\u7528\u3002\u7ed3\u5408\u5206\u7247\u4f20\u8f93\u3001\u65ad\u70b9\u7eed\u4f20\u548c\u8303\u56f4\u8bf7\u6c42\uff08Range Requests\uff09\u53ef\u63d0\u9ad8\u5927\u6587\u4ef6\uff08\u5982\u89c6\u9891\uff09\u5728\u9ad8\u5e76\u53d1\u4e0b\u7684\u4f20\u8f93\u6548\u7387\u3002\u82e5\u76ee\u6807\u7528\u6237\u96c6\u4e2d\u5728\u7279\u5b9a\u5730\u533a\uff08\u5982\u9999\u6e2f\u6216\u65b0\u52a0\u5761\uff09\uff0c\u53ef\u4f18\u5148\u9009\u62e9\u5728\u8be5\u5730\u533a\u6709\u5f3a\u8282\u70b9\u8986\u76d6\u7684 CDN\uff0c\u7ed3\u5408\u9999\u6e2f\u670d\u52a1\u5668 \u6216 \u65b0\u52a0\u5761\u670d\u52a1\u5668 \u7684\u8fb9\u7f18\u63a5\u5165\u70b9\u8fdb\u4e00\u6b65\u4f18\u5316\u4f53\u9a8c\u3002<\/p>\n<h3>\u52a8\u6001\u4ea4\u4e92\u4e0e API \u63a5\u53e3<\/h3>\n<p>API \u4e0e\u52a8\u6001\u4ea4\u4e92\u5bf9\u56de\u6e90\u4f9d\u8d56\u66f4\u9ad8\u3002\u91c7\u7528\u8fb9\u7f18\u8ba1\u7b97\uff08Edge Compute \/ Functions\uff09\u3001\u667a\u80fd\u8def\u7531\u548c\u8bf7\u6c42\u5408\u5e76\uff08request coalescing\uff09\u53ef\u4ee5\u5728\u8fb9\u7f18\u76f4\u63a5\u5904\u7406\u90e8\u5206\u903b\u8f91\uff0c\u51cf\u5c11\u56de\u6e90\u6b21\u6570\uff1b\u540c\u65f6\u5b9e\u73b0\u7194\u65ad\u3001\u961f\u5217\u548c\u9000\u907f\u7b56\u7565\u907f\u514d\u77ac\u65f6\u5cf0\u503c\u5bfc\u81f4\u540e\u7aef\u670d\u52a1\u5d29\u6e83\u3002\u8de8\u533a\u57df\u670d\u52a1\uff08\u4f8b\u5982\u7f8e\u56fd\u670d\u52a1\u5668 \u6216 \u65e5\u672c\u670d\u52a1\u5668 \u7684\u540e\u7aef\uff09\u9700\u8981\u8003\u8651\u957f\u9014\u4f20\u8f93\u7684 RTT \u548c\u4e22\u5305\u7387\uff0c\u53ef\u901a\u8fc7 HTTP\/3 \u4e0e\u62e5\u585e\u63a7\u5236\u4f18\u5316\u63d0\u5347\u7a33\u5b9a\u6027\u3002<\/p>\n<h3>\u76f4\u64ad\u4e0e\u5b9e\u65f6\u4ea4\u4ed8<\/h3>\n<p>\u76f4\u64ad\u573a\u666f\u5bf9\u5e26\u5bbd\u548c\u5ef6\u8fdf\u8981\u6c42\u6781\u9ad8\u3002CDN \u4f1a\u91c7\u53d6\u591a\u7ea7\u5206\u53d1\u3001P2P \u8f85\u52a9\uff08\u5728\u53ef\u884c\u65f6\uff09\u53ca\u5207\u7247\u6280\u672f\uff08HLS\u3001DASH\uff09\u6765\u5206\u6563\u538b\u529b\u3002\u9488\u5bf9\u5168\u7403\u89c2\u4f17\u540c\u65f6\u6d8c\u5165\u7684\u60c5\u51b5\uff0c\u91c7\u7528\u591a CDN \u8054\u5408\uff08Multi-CDN\uff09\u5e76\u914d\u7f6e\u667a\u80fd\u8c03\u5ea6\u80fd\u66f4\u597d\u6297\u51fb\u77ed\u65f6\u6d41\u91cf\u5cf0\u503c\u3002<\/p>\n<h2> \u8c01\u80fd\u201c\u7a33\u4f4f\u201d\u6d41\u91cf\u9ad8\u5cf0\uff1f\u4f18\u52bf\u5bf9\u6bd4\u8981\u70b9<\/h2>\n<p>\u6ca1\u6709\u5355\u4e00\u201c\u4e07\u80fd\u201dCDN \u80fd\u9002\u7528\u4e8e\u6240\u6709\u573a\u666f\uff0c\u4f46\u901a\u8fc7\u6bd4\u5bf9\u4ee5\u4e0b\u7ef4\u5ea6\u53ef\u4ee5\u5224\u65ad\u54ea\u4e2a\u63d0\u4f9b\u5546\u6216\u65b9\u6848\u66f4\u9002\u5408\u4f60\u7684\u4e1a\u52a1\uff1a<\/p>\n<ul>\n<li><strong>\u5168\u7403 PoP 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