{"id":209813,"date":"2025-10-23T23:41:47","date_gmt":"2025-10-23T15:41:47","guid":{"rendered":"https:\/\/www.server.hk\/blog\/209813\/"},"modified":"2025-10-23T23:41:48","modified_gmt":"2025-10-23T15:41:48","slug":"cdn-142","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/209813\/","title":{"rendered":"CDN\u9009\u578b\u6700\u4f73\u5b9e\u8df5\uff1a\u6027\u80fd\u3001\u6210\u672c\u4e0e\u5b89\u5168\u4e09\u8981\u70b9"},"content":{"rendered":"<h2>\u5f15\u8a00<\/h2>\n<p>\u968f\u7740\u5168\u7403\u5316\u6d41\u91cf\u589e\u957f\u4e0e\u7528\u6237\u4f53\u9a8c\u8981\u6c42\u63d0\u5347\uff0cCDN\uff08\u5185\u5bb9\u5206\u53d1\u7f51\u7edc\uff09\u5df2\u7ecf\u4ece\u201c\u53ef\u9009\u9879\u201d\u6210\u4e3a\u7f51\u7ad9\u3001\u79fb\u52a8\u5e94\u7528\u548c API \u7684\u57fa\u7840\u8bbe\u65bd\u5fc5\u9700\u54c1\u3002\u5bf9\u4e8e\u9762\u5411\u9999\u6e2f\u3001\u4e1c\u5357\u4e9a\u53ca\u6b27\u7f8e\u7528\u6237\u7684\u7ad9\u70b9\uff0c\u5408\u7406\u7684 CDN 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Presence\uff09\u7ec4\u6210\uff0c\u5c06\u9759\u6001\/\u52a8\u6001\u5185\u5bb9\u7f13\u5b58\u5230\u8ddd\u79bb\u7528\u6237\u66f4\u8fd1\u7684\u8fb9\u7f18\u8282\u70b9\uff0c\u4ece\u800c\u7f29\u77ed\u7f51\u7edc\u5f80\u8fd4\u65f6\u5ef6\uff08RTT\uff09\u5e76\u51cf\u8f7b\u6e90\u7ad9\u538b\u529b\u3002<\/p>\n<h3>\u5173\u952e\u6280\u672f\u4e0e\u6307\u6807<\/h3>\n<ul>\n<li><strong>\u7f13\u5b58\u547d\u4e2d\u7387\uff08Cache Hit Ratio\uff09<\/strong>\uff1a\u547d\u4e2d\u7387\u8d8a\u9ad8\uff0c\u6e90\u7ad9\u6d41\u91cf\u8d8a\u5c11\u3001\u5ef6\u8fdf\u8d8a\u4f4e\u3002\u53ef\u901a\u8fc7\u5408\u7406\u914d\u7f6e Cache-Control\u3001Expires \u4e0e Edge TTL \u6765\u63d0\u5347\u3002<\/li>\n<li><strong>\u54cd\u5e94\u65f6\u5ef6\u4e0e\u9996\u5b57\u8282\u65f6\u95f4\uff08TTFB\uff09<\/strong>\uff1a\u53d7 POP \u8986\u76d6\u3001\u7f51\u7edc\u4e92\u8054\uff08peering\uff09\u4e0e\u4f20\u8f93\u534f\u8bae\uff08HTTP\/2\u3001HTTP\/3\/QUIC\uff09\u5f71\u54cd\u3002<\/li>\n<li><strong>\u5e26\u5bbd\/\u8bf7\u6c42\u8ba1\u8d39\u6a21\u578b<\/strong>\uff1a\u4e0d\u540c\u5382\u5546\u6309\u5e26\u5bbd\u3001\u6309\u8bf7\u6c42\u3001\u5206\u5730\u533a\u5b9a\u4ef7\u6216\u7ed3\u5408\u9636\u68af\u8ba1\u8d39\uff0c\u4e86\u89e3\u8ba1\u8d39\u53e3\u5f84\uff08\u662f\u5426\u542b TLS \u63e1\u624b\u3001\u662f\u5426\u8ba1\u5165\u56de\u6e90\uff09\u975e\u5e38\u91cd\u8981\u3002<\/li>\n<li><strong>\u7f13\u5b58\u952e\uff08Cache Key\uff09\u4e0e\u53d8\u4f53\uff08Vary\uff09<\/strong>\uff1a\u7f13\u5b58\u7b56\u7565\u51b3\u5b9a\u7c92\u5ea6\uff0c\u8bef\u914d\u7f6e\u4f1a\u5bfc\u81f4\u7f13\u5b58\u788e\u7247\u5316\uff0c\u964d\u4f4e\u547d\u4e2d\u7387\u5e76\u63d0\u5347\u6210\u672c\u3002<\/li>\n<li><strong>SSL\/TLS \u652f\u6301\u4e0e\u8bc1\u4e66\u7ba1\u7406<\/strong>\uff1a\u81ea\u52a8\u5316\u8bc1\u4e66\u90e8\u7f72\u3001\u652f\u6301 SNI\u3001OCSP stapling\uff0c\u53ef\u51cf\u5c11\u8fd0\u7ef4\u590d\u6742\u5ea6\u5e76\u63d0\u5347\u5b89\u5168\u6027\u3002<\/li>\n<\/ul>\n<h2>\u6027\u80fd\u4f18\u5316\u5b9e\u8df5\uff08\u9762\u5411\u5168\u7403\u4e0e\u533a\u57df\u7528\u6237\uff09<\/h2>\n<p>\u6027\u80fd\u662f CDN \u9009\u578b\u7684\u9996\u8981\u8003\u91cf\u3002\u9488\u5bf9\u4e0d\u540c\u76ee\u6807\u5e02\u573a\uff08\u4f8b\u5982\u9999\u6e2f\u3001\u4e1c\u5357\u4e9a\u3001\u6b27\u7f8e\u6216\u65e5\u672c\u3001\u97e9\u56fd\uff09\uff0c\u9700\u8981\u7efc\u5408\u8003\u8651 POP \u8986\u76d6\u3001\u4f20\u8f93\u534f\u8bae\u4e0e\u7f13\u5b58\u7b56\u7565\u3002<\/p>\n<h3>\u9009\u62e9\u5408\u9002\u7684 POP \u8986\u76d6<\/h3>\n<ul>\n<li>\u9762\u5411\u9999\u6e2f\u4e0e\u5468\u8fb9\u4e9a\u6d32\u7528\u6237\uff1a\u4f18\u5148\u9009\u62e9\u5728\u9999\u6e2f\u3001\u65b0\u52a0\u5761\u3001\u65e5\u672c\u3001\u97e9\u56fd\u6709 PoP \u7684\u670d\u52a1\u5546\uff0c\u907f\u514d\u8de8\u592a\u5e73\u6d0b\u56de\u6e90\u9020\u6210\u9ad8\u5ef6\u8fdf\u3002<\/li>\n<li>\u9762\u5411\u5317\u7f8e\u7528\u6237\uff1a\u786e\u4fdd\u4f9b\u5e94\u5546\u5728\u7f8e\u56fd\u6709\u591a\u4e2a PoP\uff0c\u5e76\u4e14\u4e0e\u4e3b\u6d41 ISP\u3001\u4e91\u5546\u6709\u826f\u597d\u4e92\u8054\uff08peering\uff09\u3002<\/li>\n<\/ul>\n<h3>\u4f20\u8f93\u4e0e\u538b\u7f29\u4f18\u5316<\/h3>\n<ul>\n<li>\u542f\u7528 HTTP\/2 \u4e0e HTTP\/3\uff08QUIC\uff09\uff1a\u51cf\u5c11\u63e1\u624b\u6b21\u6570\u3001\u63d0\u5347\u5e76\u53d1\u52a0\u8f7d\u6027\u80fd\uff0c\u5c24\u5176\u5bf9\u79fb\u52a8\u7aef\u7528\u6237\u6709\u660e\u663e\u6539\u5584\u3002<\/li>\n<li>\u5f00\u542f Brotli \u4e0e Gzip \u538b\u7f29\uff1a\u5bf9\u6587\u672c\u7c7b\u8d44\u6e90\uff08HTML\u3001CSS\u3001JS\uff09\u4f18\u5148\u4f7f\u7528 Brotli\uff08\u8d28\u91cf\u7ea7\u522b\u4e0e CPU \u8d1f\u8f7d\u9700\u6743\u8861\uff09\u3002<\/li>\n<li>\u5408\u7406\u4f7f\u7528 CDN \u8fb9\u7f18\u7f13\u5b58\u4e0e\u9884\u53d6\uff08prefetch\/Prerender\uff09\uff1a\u5bf9\u70ed\u95e8\u8d44\u6e90\u63d0\u524d\u7f13\u5b58\u6216\u901a\u8fc7 Cache-Control: stale-while-revalidate \u63d0\u4f9b\u66f4\u5e73\u6ed1\u7684\u4f53\u9a8c\u3002<\/li>\n<\/ul>\n<h3>\u7f13\u5b58\u7b56\u7565\u7ec6\u5316<\/h3>\n<ul>\n<li>\u9759\u6001\u8d44\u6e90\uff08\u7248\u672c\u5316\u6587\u4ef6\u540d\uff09\u8bbe\u957f TTL\uff0c\u52a8\u6001\u5185\u5bb9\u914d\u5408 Cache-Control\u3001Surrogate-Key \u4e0e\u7f13\u5b58\u5206\u7247\u7b56\u7565\u3002<\/li>\n<li>\u5229\u7528 Origin Shield \u6216\u4e2d\u95f4\u5c42 PoP \u51cf\u5c11\u56de\u6e90\u8bf7\u6c42\u9891\u7387\uff0c\u9002\u7528\u4e8e\u9ad8\u5e76\u53d1\u573a\u666f\u3002<\/li>\n<li>\u81ea\u5b9a\u4e49 Cache Key\uff08\u79fb\u9664\u4e0d\u5fc5\u8981\u7684\u67e5\u8be2\u53c2\u6570\u3001\u901a\u8fc7 Header \u63a7\u5236\u53d8\u4f53\uff09\u4ee5\u964d\u4f4e\u7f13\u5b58\u788e\u7247\u5316\u3002<\/li>\n<\/ul>\n<h2>\u6210\u672c\u63a7\u5236\u7b56\u7565<\/h2>\n<p>CDN \u6210\u672c\u4e0d\u53ea\u662f\u770b\u5355\u4ef7\uff0c\u8fd8\u8981\u5173\u6ce8\u5b9e\u9645\u7528\u91cf\u3001\u56de\u6e90\u9891\u7387\u4e0e\u9690\u85cf\u8d39\u7528\u3002\u5408\u7406\u7684\u6210\u672c\u6a21\u578b\u80fd\u5728\u4fdd\u8bc1\u6027\u80fd\u7684\u524d\u63d0\u4e0b\u964d\u4f4e\u603b\u4f53 TCO\uff08Total Cost of Ownership\uff09\u3002<\/p>\n<h3>\u7406\u89e3\u8ba1\u8d39\u7ec6\u5219<\/h3>\n<ul>\n<li>\u5e26\u5bbd\u8ba1\u8d39\uff1a\u6309\u6d41\u91cf\u8ba1\u8d39\u65f6\uff0c\u5730\u533a\u6d41\u91cf\u5355\u4ef7\u5dee\u5f02\u8f83\u5927\uff08\u4f8b\u5982\u7f8e\u56fd\u3001\u9999\u6e2f\u3001\u65b0\u52a0\u5761\u3001\u65e5\u97e9\u4ef7\u683c\u901a\u5e38\u4f4e\u4e8e\u504f\u8fdc\u5730\u533a\uff09\u3002<\/li>\n<li>\u8bf7\u6c42\u8ba1\u8d39\uff1a\u5c0f\u6587\u4ef6\/\u77ed\u8fde\u63a5\u7684\u573a\u666f\u8bf7\u6c42\u91cf\u5927\u65f6\uff0c\u6309\u8bf7\u6c42\u8ba1\u8d39\u53ef\u80fd\u6210\u4e3a\u4e3b\u8981\u5f00\u652f\u3002<\/li>\n<li>\u56de\u6e90\u8d39\u7528\uff1a\u6e90\u7ad9\u5e26\u5bbd\u6216\u4e91\u63d0\u4f9b\u5546\u51fa\u7ad9\u8d39\u7528\uff08\u5c24\u5176\u662f\u6d77\u5916\u670d\u52a1\u5668\u6216\u7f8e\u56fd\u670d\u52a1\u5668\uff09\u4f1a\u5f71\u54cd\u603b\u4f53\u6210\u672c\u3002<\/li>\n<\/ul>\n<h3>\u964d\u4f4e\u8d39\u7528\u7684\u5b9e\u64cd\u5efa\u8bae<\/h3>\n<ul>\n<li>\u63d0\u5347\u7f13\u5b58\u547d\u4e2d\u7387\uff1a\u901a\u8fc7\u957f TTL\u3001\u8d44\u6e90\u7248\u672c\u5316\u4e0e\u8fb9\u7f18\u7f13\u5b58\u7b56\u7565\u51cf\u5c11\u56de\u6e90\u5e26\u5bbd\u3002<\/li>\n<li>\u533a\u57df\u5316\u7b56\u7565\uff1a\u5bf9\u6d41\u91cf\u4e3b\u8981\u6765\u81ea\u4e9a\u6d32\u7684\u4e1a\u52a1\uff0c\u53ef\u9009\u62e9\u5728\u9999\u6e2f\u3001\u4e1c\u4eac\u3001\u65b0\u52a0\u5761\u3001\u91dc\u5c71\u7b49\u6709\u826f\u597d PoP \u7684\u4f9b\u5e94\u5546\uff0c\u4ee5\u964d\u4f4e\u8de8\u6d0b\u5e26\u5bbd\u8d39\u7528\u3002<\/li>\n<li>\u4f7f\u7528\u591a\u4f9b\u5e94\u5546\u7b56\u7565\uff1a\u5728\u9ad8\u5cf0\u6216\u7279\u6b8a\u6d3b\u52a8\u671f\uff0c\u901a\u8fc7\u6d41\u91cf\u8c03\u5ea6\u5c06\u90e8\u5206\u8bf7\u6c42\u8f6c\u5230\u4f4e\u4ef7\u6216\u5197\u4f59\u7684 CDN\uff0c\u4ece\u800c\u5e73\u6ed1\u6210\u672c\u4e0e\u63d0\u5347\u53ef\u7528\u6027\u3002<\/li>\n<\/ul>\n<h2>\u5b89\u5168\u4e0e\u5408\u89c4\u8003\u91cf<\/h2>\n<p>CDN \u5df2\u6210\u4e3a\u7b2c\u4e00\u9053\u5b89\u5168\u9632\u7ebf\u3002\u9664\u4e86\u57fa\u7840\u7684 TLS \u52a0\u5bc6\uff0c\u4f18\u79c0\u7684 CDN \u63d0\u4f9b\u5546\u8fd8\u4f1a\u96c6\u6210 WAF\u3001DDoS \u7f13\u89e3\u3001Bot \u7ba1\u7406\u4e0e\u901f\u7387\u9650\u5236\u7b49\u529f\u80fd\u3002<\/p>\n<h3>\u6838\u5fc3\u5b89\u5168\u80fd\u529b<\/h3>\n<ul>\n<li><strong>HTTPS\/TLS \u5168\u94fe\u8def\u52a0\u5bc6<\/strong>\uff1a\u652f\u6301\u81ea\u52a8\u8bc1\u4e66\u3001\u6700\u4f4e TLS \u7248\u672c\u8bbe\u5b9a\u4e0e\u524d\u5411\u4fdd\u5bc6\uff08PFS\uff09\u3002<\/li>\n<li><strong>Web \u5e94\u7528\u9632\u706b\u5899\uff08WAF\uff09<\/strong>\uff1a\u89c4\u5219\u96c6\u652f\u6301\u5b9a\u5236\u4e0e\u5b9e\u65f6\u66f4\u65b0\uff0c\u80fd\u591f\u9632\u62a4 SQL \u6ce8\u5165\u3001XSS\u3001\u6587\u4ef6\u5305\u542b\u7b49\u5e38\u89c1\u653b\u51fb\u3002<\/li>\n<li><strong>DDoS \u9632\u62a4<\/strong>\uff1a\u8fb9\u7f18\u5438\u6536\u5927\u89c4\u6a21\u6d41\u91cf\u653b\u51fb\u5e76\u914d\u5408\u901f\u7387\u9650\u5236\u3001\u9ed1\u540d\u5355\/\u767d\u540d\u5355\u7b56\u7565\u3002<\/li>\n<li><strong>Bot 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