{"id":210159,"date":"2025-10-24T07:01:26","date_gmt":"2025-10-23T23:01:26","guid":{"rendered":"https:\/\/www.server.hk\/blog\/210159\/"},"modified":"2025-10-24T07:01:27","modified_gmt":"2025-10-23T23:01:27","slug":"cdn%e6%96%b0%e6%8a%80%e6%9c%af%e5%a6%82%e4%bd%95%e5%ae%9e%e7%8e%b0%e7%9f%ad","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/210159\/","title":{"rendered":"CDN\u65b0\u6280\u672f\u5982\u4f55\u5b9e\u73b0\u77ed\u89c6\u9891\u79d2\u5f00\uff1f"},"content":{"rendered":"<p>\u5728\u77ed\u89c6\u9891\u6210\u4e3a\u4e3b\u6d41\u6d41\u91cf\u5f62\u5f0f\u7684\u4eca\u5929\uff0c\u7528\u6237\u5bf9\u201c\u79d2\u5f00\u201d\u7684\u671f\u671b\u8d8a\u6765\u8d8a\u9ad8\u3002\u77ed\u89c6\u9891\u79d2\u5f00\u4e0d\u4ec5\u5173\u4e4e\u7528\u6237\u4f53\u9a8c\uff0c\u8fd8\u76f4\u63a5\u5f71\u54cd\u7559\u5b58\u4e0e\u8f6c\u5316\u3002\u4f20\u7edf CDN \u901a\u8fc7\u7b80\u5355\u7684\u9759\u6001\u52a0\u901f\u5df2\u7ecf\u96be\u4ee5\u6ee1\u8db3\u4f4e\u5ef6\u8fdf\u3001\u9ad8\u5e76\u53d1\u4e0b\u7684\u79d2\u5f00\u9700\u6c42\u3002\u672c\u6587\u9762\u5411\u7ad9\u957f\u3001\u4f01\u4e1a\u548c\u5f00\u53d1\u8005\uff0c\u4ece\u6280\u672f\u539f\u7406\u3001\u5b9e\u9645\u5e94\u7528\u573a\u666f\u3001\u4f18\u52bf\u5bf9\u6bd4\u4e0e\u9009\u8d2d\u5efa\u8bae\u56db\u4e2a\u7ef4\u5ea6\uff0c\u6df1\u5165\u89e3\u6790<strong>CDN 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\u65b0\u6280\u672f\u6808\u5982\u4f55\u534f\u540c\u5b9e\u73b0\u79d2\u5f00<\/h2>\n<h3>1. \u8fb9\u7f18\u8ba1\u7b97\u4e0e\u667a\u80fd\u7f13\u5b58\u7b56\u7565<\/h3>\n<p>\u4f20\u7edf CDN \u53ea\u662f\u9759\u6001\u7f13\u5b58\uff0c\u800c\u73b0\u4ee3 CDN \u5728\u8fb9\u7f18\u8282\u70b9\u5f15\u5165\u4e86\u8f7b\u91cf\u5316\u8ba1\u7b97\u80fd\u529b\uff0c\u53ef\u5728\u8282\u70b9\u505a\u5b9e\u65f6\u8f6c\u7801\u3001\u5c01\u88c5\uff08\u5982 CMAF\u3001LL-HLS\u3001\u4f4e\u5ef6\u8fdf DASH\uff09\u4e0e ABR \u7b97\u6cd5\u524d\u7f6e\u8ba1\u7b97\u3002\u901a\u8fc7\u4ee5\u4e0b\u673a\u5236\u63d0\u5347\u79d2\u5f00\uff1a<\/p>\n<ul>\n<li><strong>\u5c0f\u7247\u5316\u4e0e\u9996\u5305\u4f18\u5316<\/strong>\uff1a\u5c06\u89c6\u9891\u5207\u5206\u6210\u66f4\u5c0f\u7684\u521d\u59cb\u5316\u7247\uff08init fragment \u6216 fMP4 init+\u7b2c\u4e00\u5c0f\u7247\uff09\uff0c\u4f7f\u9996\u5305\u66f4\u5c0f\u3001\u66f4\u5feb\u5230\u8fbe\u5ba2\u6237\u7aef\uff1b<\/li>\n<li><strong>\u9884\u53d6\u4e0e\u9884\u89e3\u6790<\/strong>\uff1a\u57fa\u4e8e\u7528\u6237\u884c\u4e3a\u548c\u64ad\u653e\u8def\u5f84\u9884\u6d4b\uff0c\u8fb9\u7f18\u8282\u70b9\u5bf9\u53ef\u80fd\u64ad\u653e\u7684\u89c6\u9891\u8fdb\u884c\u7f13\u5b58\u9884\u70ed\u4e0e\u77ed\u671f\u4fdd\u7559\uff1b<\/li>\n<li><strong>\u672c\u5730\u5316\u8f6c\u7801\/\u5c01\u88c5<\/strong>\uff1a\u5728\u8fb9\u7f18\u8282\u70b9\u505a\u7801\u7387\u8f6c\u6362\u6216\u6253\u5305\uff0c\u907f\u514d\u56de\u6e90\u5ef6\u8fdf\uff0c\u652f\u6301\u6309\u9700\u4e0b\u53d1\u6700\u5408\u9002\u7684\u9996\u5305\u3002<\/li>\n<\/ul>\n<h3>2. \u4f20\u8f93\u5c42\u4e0e\u534f\u8bae\u4f18\u5316\uff1aHTTP\/2\u3001HTTP\/3\uff08QUIC\uff09\u548c TLS \u52a0\u901f<\/h3>\n<p>\u7f51\u7edc\u4f20\u8f93\u5c42\u7684\u4f18\u5316\u662f\u79d2\u5f00\u7684\u6838\u5fc3\u3002HTTP\/3 \u57fa\u4e8e QUIC\uff08UDP\uff09\u80fd\u663e\u8457\u51cf\u5c11\u8fde\u63a5\u5efa\u7acb\u4e0e\u4e22\u5305\u91cd\u4f20\u7684\u5ef6\u65f6\uff1a<\/p>\n<ul>\n<li><strong>0-RTT \u4e0e\u8fde\u63a5\u590d\u7528<\/strong>\uff1aQUIC \u652f\u6301 0-RTT \u91cd\u7528\uff0c\u4ece\u800c\u5728\u91cd\u8fde\u6216\u9875\u9762\u5207\u6362\u65f6\u5b9e\u73b0\u8fd1\u4e4e\u96f6\u63e1\u624b\u5ef6\u8fdf\uff1b<\/li>\n<li><strong>\u6d41\u590d\u7528\u4e0e\u4e22\u5305\u9694\u79bb<\/strong>\uff1aQUIC \u7684\u591a\u6d41\u8bbe\u8ba1\u907f\u514d\u5355\u6d41\u4e22\u5305\u963b\u585e\uff08head-of-line blocking\uff09\uff0c\u63d0\u9ad8\u9996\u5e27\u5230\u8fbe\u7684\u7a33\u5b9a\u6027\uff1b<\/li>\n<li><strong>TLS \u5feb\u901f\u63e1\u624b\u4e0e\u8bc1\u4e66\u4f18\u5316<\/strong>\uff1a\u4f7f\u7528 OCSP Stapling\u3001\u77ed\u671f\u8bc1\u4e66\u548c\u52a0\u901f\u7684 TLS \u63e1\u624b\uff08\u5982 TLS 1.3\uff09\u51cf\u5c11\u52a0\u5bc6\u5f00\u9500\u3002<\/li>\n<\/ul>\n<h3>3. \u4f20\u8f93\u63a7\u5236\u4e0e\u62e5\u585e\/\u541e\u5410\u9884\u6d4b<\/h3>\n<p>\u77ed\u89c6\u9891\u79d2\u5f00\u4f9d\u8d56\u4e8e\u5bf9\u53ef\u7528\u5e26\u5bbd\u7684\u5feb\u901f\u4f30\u8ba1\u4e0e\u5408\u7406\u7684\u521d\u59cb\u7801\u7387\u9009\u62e9\uff1a<\/p>\n<ul>\n<li><strong>\u5feb\u901f\u5e26\u5bbd\u4f30\u8ba1<\/strong>\uff1a\u4f7f\u7528\u5c0f\u6d41\u91cf\u63a2\u6d4b\u3001\u5386\u53f2\u4f1a\u8bdd\u7edf\u8ba1\u548c\u7f51\u7edc\u8d28\u91cf\u4fe1\u53f7\uff08RTT\u3001\u4e22\u5305\u7387\uff09\u9884\u6d4b\u53ef\u7528\u5e26\u5bbd\uff1b<\/li>\n<li><strong>\u667a\u80fd\u521d\u59cb\u7801\u7387<\/strong>\uff1a\u7ed3\u5408\u7ec8\u7aef\u80fd\u529b\u4e0e\u7f51\u7edc\u4f30\u8ba1\uff0c\u52a8\u6001\u9009\u62e9\u66f4\u4fdd\u5b88\u6216\u66f4\u6fc0\u8fdb\u7684\u8d77\u59cb\u7801\u7387\uff0c\u51cf\u5c11\u9996\u5c4f\u91cd\u7f13\u51b2\uff1b<\/li>\n<li><strong>\u62e5\u585e\u63a7\u5236\u7b56\u7565\u4f18\u5316<\/strong>\uff1a\u91c7\u7528 BBR \u7c7b\u7b97\u6cd5\u6216 QUIC \u4f18\u5316\u7684\u62e5\u585e\u63a7\u5236\uff0c\u4f7f\u5728\u77ed\u8fde\u63a5\u573a\u666f\u4e0b\u66f4\u5feb\u8fbe\u5230\u7a33\u5b9a\u541e\u5410\u3002<\/li>\n<\/ul>\n<h3>4. \u6d41\u5a92\u4f53\u5c01\u88c5\u4e0e ABR\uff08\u81ea\u9002\u5e94\u7801\u7387\uff09\u7b56\u7565<\/h3>\n<p>\u5c01\u88c5\u683c\u5f0f\u548c ABR \u7b97\u6cd5\u5bf9\u9996\u5e27\u901f\u5ea6\u5f71\u54cd\u663e\u8457\uff1a<\/p>\n<ul>\n<li><strong>CMAF \u4e0e\u4f4e\u5ef6\u8fdf HLS\/DASH<\/strong>\uff1a\u7edf\u4e00\u7684\u6253\u5305\u683c\u5f0f\uff08CMAF\uff09\u53ef\u4ee5\u7f29\u77ed segment \u5927\u5c0f\u5e76\u542f\u7528 chunked \u4f20\u8f93\uff0c\u5b9e\u73b0 100s \u6beb\u79d2\u7ea7\u542f\u52a8\uff1b<\/li>\n<li><strong>\u5206\u5c42\u7f16\u7801\uff08SVC\uff09\u4e0e\u5feb\u901f\u5207\u6362<\/strong>\uff1a\u901a\u8fc7 SVC \u53ef\u4ee5\u5728\u5ba2\u6237\u7aef\u5148\u62c9\u53d6\u4f4e\u5206\u8fa8\u7387\u57fa\u7ebf\u6d41\u5feb\u901f\u663e\u793a\uff0c\u968f\u540e\u5e73\u6ed1\u5347\u7ea7\uff1b<\/li>\n<li><strong>\u6df7\u5408 ABR \u7b97\u6cd5<\/strong>\uff1a\u5c06\u541e\u5410\/\u5ef6\u8fdf\/\u7f13\u51b2\u4e09\u7c7b\u4fe1\u53f7\u878d\u5408\uff0c\u5feb\u901f\u800c\u7a33\u5065\u5730\u51b3\u5b9a\u9996\u5e27\u4e0e\u540e\u7eed\u7801\u7387\u3002<\/li>\n<\/ul>\n<h3>5. \u8fb9\u7f18\u534f\u540c\u4e0e\u591a\u5730\u57df\u90e8\u7f72<\/h3>\n<p>\u77ed\u89c6\u9891\u7528\u6237\u5206\u5e03\u5e7f\u6cdb\uff0c\u8fb9\u7f18\u8282\u70b9\u4e0e\u591a\u5730\u57df\u540c\u6b65\u7b56\u7565\u5f88\u91cd\u8981\uff1a<\/p>\n<ul>\n<li><strong>\u591a\u70b9 PoP \u4e0e\u667a\u80fd\u8c03\u5ea6<\/strong>\uff1a\u6839\u636e\u7528\u6237\u5730\u7406\u4f4d\u7f6e\u3001\u7f51\u7edc\u6761\u4ef6\u8c03\u5ea6\u6700\u8fd1\u4e14\u5065\u5eb7\u7684\u8fb9\u7f18\u8282\u70b9\uff0c\u51cf\u5c11\u8de8\u6d0b\u4f20\u8f93\u3002\u5bf9\u4e8e\u9762\u5411\u9999\u6e2f\u3001\u4e1c\u4e9a\uff08\u65e5\u672c\u3001\u97e9\u56fd\u3001\u65b0\u52a0\u5761\uff09\u6216\u7f8e\u56fd\u7528\u6237\uff0c\u5408\u7406\u9009\u62e9 PoP \u81f3\u5173\u91cd\u8981\uff1b<\/li>\n<li><strong>Origin Shield \u4e0e\u56de\u6e90\u4f18\u5316<\/strong>\uff1a\u5728\u56de\u6e90\u8def\u5f84\u6dfb\u52a0\u4e2d\u95f4\u5c42\u53ef\u4ee5\u51cf\u5c11 Origin \u538b\u529b\u4e0e\u56de\u6e90\u5ef6\u8fdf\uff1b<\/li>\n<li><strong>\u8de8\u5883\u94fe\u8def\u4f18\u5316<\/strong>\uff1a\u4f7f\u7528\u4e13\u7ebf\u3001\u667a\u80fd\u8def\u7531\u6216 CDN \u52a0\u901f\u94fe\u8def\uff0c\u964d\u4f4e\u9999\u6e2f\u5230\u7f8e\u897f\/\u7f8e\u4e1c\u3001\u591a\u56fd\u8282\u70b9\u95f4\u7684 RTT\u3002<\/li>\n<\/ul>\n<h2>\u5e94\u7528\u573a\u666f\uff1a\u8c01\u6700\u9700\u8981\u8fd9\u4e9b\u65b0\u6280\u672f\uff1f<\/h2>\n<p>\u77ed\u89c6\u9891\u5e73\u53f0\u3001\u793e\u4ea4\u5e94\u7528\u3001\u65b0\u95fb\u5a92\u4f53\u3001\u5e7f\u544a\u5206\u53d1\u548c\u7535\u5546\u76f4\u64ad\u7b49\u573a\u666f\u5bf9\u79d2\u5f00\u8981\u6c42\u9ad8\u3002\u4e0d\u540c\u573a\u666f\u7684\u4fa7\u91cd\u70b9\uff1a<\/p>\n<ul>\n<li>\u5185\u5bb9\u5206\u53d1\u578b\u5e73\u53f0\u66f4\u5173\u6ce8<strong>\u7f13\u5b58\u547d\u4e2d\u7387<\/strong>\u4e0e\u8fb9\u7f18\u9884\u70ed\uff1b<\/li>\n<li>\u5b9e\u65f6\u4e92\u52a8\u6216\u5e26\u5ef6\u65f6\u9650\u5236\u7684\u76f4\u64ad\u4fa7\u91cd<strong>\u4f4e\u5ef6\u8fdf\u4f20\u8f93\u4e0e\u5feb\u901f\u5207\u6362<\/strong>\uff1b<\/li>\n<li>\u8de8\u56fd\u5206\u53d1\uff08\u5982\u9762\u5411\u9999\u6e2f\u3001\u7f8e\u56fd\u3001\u65e5\u672c\u3001\u97e9\u56fd\u3001\u65b0\u52a0\u5761\u7528\u6237\uff09\u5219\u66f4\u770b\u91cd<strong>\u591a\u5730\u57df PoP 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\u80fd\u4ee5\u66f4\u5c11\u5e26\u5bbd\u63d0\u4f9b\u53ef\u63a5\u53d7\u9996\u5c4f\u8d28\u91cf\uff1b<\/li>\n<li><strong>\u8fd0\u8425\u6210\u672c<\/strong>\uff1a\u8fb9\u7f18\u8f6c\u7801\u4e0e\u672c\u5730\u7f13\u5b58\u63d0\u9ad8\u7f13\u5b58\u547d\u4e2d\uff0c\u80fd\u964d\u4f4e\u56de\u6e90\u6d41\u91cf\u4e0e\u4e91\u8d44\u6e90\u5f00\u652f\uff0c\u4f46\u8fb9\u7f18\u8ba1\u7b97\u80fd\u529b\u9700\u989d\u5916\u6295\u5165\uff1b<\/li>\n<li><strong>\u90e8\u7f72\u590d\u6742\u5ea6<\/strong>\uff1a\u65b0\u534f\u8bae\u4e0e\u5c01\u88c5\u5e26\u6765\u5ba2\u6237\u7aef\u4e0e\u670d\u52a1\u7aef\u517c\u5bb9\u6027\u6d4b\u8bd5\u6210\u672c\uff0c\u9700\u8981\u5de5\u7a0b\u5316\u652f\u6301\u3002<\/li>\n<\/ul>\n<h2>\u9009\u8d2d\u5efa\u8bae\uff1a\u5982\u4f55\u4e3a\u77ed\u89c6\u9891\u90e8\u7f72\u5408\u9002\u7684 CDN \u4e0e\u670d\u52a1\u5668\u8d44\u6e90<\/h2>\n<p>\u5728\u9009\u62e9 CDN 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