{"id":209543,"date":"2025-10-23T16:37:49","date_gmt":"2025-10-23T08:37:49","guid":{"rendered":"https:\/\/www.server.hk\/blog\/209543\/"},"modified":"2025-10-23T16:37:50","modified_gmt":"2025-10-23T08:37:50","slug":"cdn-30","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/209543\/","title":{"rendered":"CDN\u5e26\u5bbd\u4f18\u5316\u5b9e\u6218\uff1a\u4e03\u5927\u65b9\u6cd5\u63d0\u5347\u6027\u80fd\u3001\u964d\u4f4e\u6210\u672c"},"content":{"rendered":"<p>\u5728\u5f53\u4eca\u5168\u7403\u5316\u4e0e\u5b9e\u65f6\u4ea4\u4ed8\u5e76\u91cd\u7684\u4e92\u8054\u7f51\u73af\u5883\u4e2d\uff0cCDN\uff08\u5185\u5bb9\u5206\u53d1\u7f51\u7edc\uff09\u65e2\u662f\u63d0\u5347\u7528\u6237\u4f53\u9a8c\u7684\u91cd\u8981\u5229\u5668\uff0c\u4e5f\u662f\u63a7\u5236\u5e26\u5bbd\u6210\u672c\u7684\u5173\u952e\u624b\u6bb5\u3002\u5bf9\u7ad9\u957f\u3001\u4f01\u4e1a\u548c\u5f00\u53d1\u8005\u800c\u8a00\uff0c\u638c\u63e1\u5b9e\u6218\u6027\u5f3a\u7684\u5e26\u5bbd\u4f18\u5316\u65b9\u6cd5\uff0c\u4e0d\u4ec5\u80fd\u663e\u8457\u51cf\u5c11\u8fb9\u7f18\u6d41\u91cf\u548c\u539f\u70b9\u51fb\u7a7f\uff0c\u8fd8\u80fd\u63d0\u9ad8\u53ef\u7528\u6027\u4e0e\u5b89\u5168\u6027\u3002\u672c\u6587\u4ece\u539f\u7406\u5230\u5b9e\u64cd\u3001\u4ece\u4f18\u52bf\u5bf9\u6bd4\u5230\u9009\u8d2d\u5efa\u8bae\uff0c\u7cfb\u7edf\u4ecb\u7ecd\u4e03\u5927\u53ef\u843d\u5730\u7684CDN\u5e26\u5bbd\u4f18\u5316\u7b56\u7565\uff0c\u5e2e\u52a9\u8bfb\u8005\u5728\u9999\u6e2f\u670d\u52a1\u5668\u3001\u7f8e\u56fd\u670d\u52a1\u5668\u7b49\u591a\u533a\u57df\u5e03\u7f72\u65f6\u505a\u51fa\u66f4\u4f18\u51b3\u7b56\u3002<\/p>\n<h2>CDN\u5e26\u5bbd\u4f18\u5316\u7684\u57fa\u672c\u539f\u7406\u4e0e\u8bc4\u4f30\u6307\u6807<\/h2>\n<p>\u5e26\u5bbd\u4f18\u5316\u7684\u672c\u8d28\u662f\u901a\u8fc7\u63d0\u9ad8\u7f13\u5b58\u547d\u4e2d\u7387\u548c\u51cf\u5c11\u5230\u6e90\u7ad9\u7684\u6d41\u91cf\u8bf7\u6c42\uff0c\u4ece\u800c\u964d\u4f4e\u51fa\u53e3\uff08egress\uff09\u8d39\u7528\u4e0e\u5e26\u5bbd\u74f6\u9888\u3002\u5173\u952e\u8bc4\u4f30\u6307\u6807\u5305\u62ec\uff1a<\/p>\n<ul>\n<li><strong>\u7f13\u5b58\u547d\u4e2d\u7387\uff08Cache Hit Ratio\uff09<\/strong>\uff1a\u8fb9\u7f18\u7f13\u5b58\u76f4\u63a5\u54cd\u5e94\u8bf7\u6c42\u7684\u6bd4\u4f8b\uff0c\u547d\u4e2d\u7387\u8d8a\u9ad8\u5230\u6e90\u6d41\u91cf\u8d8a\u5c11\u3002<\/li>\n<li><strong>\u5b57\u8282\u547d\u4e2d\u7387\uff08Byte Hit Ratio\uff09<\/strong>\uff1a\u4ee5\u6d41\u91cf\u5b57\u8282\u4e3a\u5355\u4f4d\u8861\u91cf\u7f13\u5b58\u6536\u76ca\uff0c\u5bf9\u5927\u6587\u4ef6\u573a\u666f\u5c24\u4e3a\u91cd\u8981\u3002<\/li>\n<li><strong>\u8fb9\u7f18\u5e26\u5bbd\u5cf0\u503c<\/strong>\uff1aCDN POP \u7684\u77ac\u65f6\u51fa\u7ad9\u5e26\u5bbd\uff0c\u5f71\u54cd\u6210\u672c\u4e0e\u6297\u538b\u80fd\u529b\u3002<\/li>\n<li><strong>\u56de\u6e90\u6d41\u91cf\uff08Origin Egress\uff09<\/strong>\uff1a\u4ece\u6e90\u7ad9\u88ab\u62c9\u53d6\u7684\u6570\u636e\u91cf\uff0c\u76f4\u63a5\u51b3\u5b9a\u5e26\u5bbd\u6210\u672c\u3002<\/li>\n<\/ul>\n<p>\u5728\u4e0d\u540c\u5730\u7406\u4f4d\u7f6e\uff08\u4f8b\u5982\u9999\u6e2f\u3001\u7f8e\u56fd\u3001\u65e5\u672c\u3001\u97e9\u56fd\u3001\u65b0\u52a0\u5761\uff09\u7528\u6237\u5206\u5e03\u5dee\u5f02\u4f1a\u5f71\u54cd\u8fd9\u4e9b\u6307\u6807\uff0c\u56e0\u6b64\u5e94\u7ed3\u5408\u8bbf\u95ee\u65e5\u5fd7\u548c\u5730\u7406\u5206\u6790\u5236\u5b9a\u7b56\u7565\u3002<\/p>\n<h2>\u4e03\u5927\u5b9e\u6218\u65b9\u6cd5\u8be6\u89e3<\/h2>\n<h3>1. \u7cbe\u7ec6\u5316\u8fb9\u7f18\u7f13\u5b58\u7b56\u7565\u4e0eTTL\u8c03\u4f18<\/h3>\n<p>\u901a\u8fc7\u5408\u7406\u8bbe\u7f6e\u7f13\u5b58\u65f6\u957f\uff08TTL\uff09\u3001Cache-Control \u4e0e Expires \u5934\uff0c\u4ee5\u53ca\u5229\u7528\u57fa\u4e8e\u8def\u5f84\u6216\u6587\u4ef6\u7c7b\u578b\u7684\u5dee\u5f02\u5316\u7f13\u5b58\u7b56\u7565\uff0c\u80fd\u663e\u8457\u63d0\u5347\u7f13\u5b58\u547d\u4e2d\u7387\u3002<\/p>\n<ul>\n<li>\u9759\u6001\u8d44\u6e90\uff08JS\/CSS\/\u56fe\u7247\uff09\u8bbe\u7f6e\u8f83\u957f\u7684max-age\u5e76\u91c7\u7528\u7248\u672c\u5316URL\uff08\u5982 file.v1.js \u2192 file.v2.js\uff09\uff0c\u907f\u514d\u9891\u7e41\u4e3b\u52a8\u6e05\u7406\u3002<\/li>\n<li>\u5bf9\u7ecf\u5e38\u66f4\u65b0\u7684\u52a8\u6001\u63a5\u53e3\uff0c\u4f7f\u7528\u77edTTL\u6216\u91c7\u7528Stale-While-Revalidate\u7b56\u7565\uff0c\u4fdd\u8bc1\u54cd\u5e94\u5feb\u901f\u540c\u65f6\u5728\u540e\u53f0\u5237\u65b0\u7f13\u5b58\u3002<\/li>\n<li>\u5229\u7528CDN\u7684\u201c\u7f13\u5b58\u5206\u5c42\u201d\u6216\u201cTiered Cache\/Origin Shield\u201d\u51cf\u5c11\u4e0d\u540cPOP\u5bf9\u6e90\u7ad9\u7684\u5e76\u53d1\u56de\u6e90\u8bf7\u6c42\u3002<\/li>\n<\/ul>\n<h3>2. \u4f18\u5316\u7f13\u5b58\u952e\u4e0e\u5185\u5bb9\u5206\u79bb\uff08Cache Key &amp; Content Segregation\uff09<\/h3>\n<p>\u9ed8\u8ba4\u7684\u7f13\u5b58\u952e\u53ef\u80fd\u5305\u542b\u4f1a\u5bfc\u81f4\u65e0\u6548\u7f13\u5b58\u7684\u8bf7\u6c42\u53c2\u6570\uff08\u5982 session\u3001utm \u53c2\u6570\uff09\u3002\u901a\u8fc7\u81ea\u5b9a\u4e49\u7f13\u5b58\u952e\u53ea\u4fdd\u7559\u5f71\u54cd\u5185\u5bb9\u7684\u90e8\u5206\uff0c\u53ef\u4ee5\u589e\u52a0\u547d\u4e2d\u3002<\/p>\n<ul>\n<li>\u79fb\u9664\u6216\u5ffd\u7565\u4e0d\u5f71\u54cd\u6e32\u67d3\u7684\u67e5\u8be2\u53c2\u6570\uff1b\u5bf9\u9700\u8981\u7684\u53c2\u6570\u91c7\u53d6\u767d\u540d\u5355\u65b9\u5f0f\u3002<\/li>\n<li>\u5c06\u9759\u6001\u4e0e\u52a8\u6001\u5185\u5bb9\u62c6\u5206\u4e0d\u540c\u7684\u57df\u540d\u6216\u8def\u5f84\uff08\u4f8b\u5982\u9759\u6001\u8d44\u6e90\u8d70cdn.static.example.com\uff09\uff0c\u4fbf\u4e8e\u5355\u72ec\u8c03\u4f18\u7f13\u5b58\u7b56\u7565\u3002<\/li>\n<\/ul>\n<h3>3. \u4f20\u8f93\u5c42\u4e0e\u5185\u5bb9\u538b\u7f29\uff08Gzip\u3001Brotli\u3001\u56fe\u7247\u683c\u5f0f\uff09<\/h3>\n<p>\u538b\u7f29\u76f4\u63a5\u51cf\u5c11\u4f20\u8f93\u5b57\u8282\uff0c\u662f\u964d\u4f4e\u5e26\u5bbd\u6210\u672c\u6700\u76f4\u63a5\u7684\u624b\u6bb5\u4e4b\u4e00\u3002<\/p>\n<ul>\n<li>\u6587\u672c\u8d44\u6e90\u542f\u7528 Brotli\uff08vary: Accept-Encoding\uff09\u4f18\u5148\u4e8e Gzip\uff0c\u80fd\u5728 HTTP\/2\/3 \u4e0b\u5e26\u6765\u66f4\u9ad8\u538b\u7f29\u7387\u3002<\/li>\n<li>\u56fe\u7247\u4f7f\u7528 WebP \u6216 AVIF\uff0c\u5e76\u6839\u636e\u5ba2\u6237\u7aef UA \u505a\u683c\u5f0f\u534f\u5546\u3002\u5bf9\u4e0d\u652f\u6301\u7684\u5ba2\u6237\u7aef\u56de\u9000 JPEG\/PNG\u3002<\/li>\n<li>\u5bf9\u89c6\u9891\u4f7f\u7528\u81ea\u9002\u5e94\u6d41\uff08HLS\/DASH\uff09\u7ed3\u5408\u7801\u7387\u5206\u5c42\uff0c\u5ba2\u6237\u7aef\u53ea\u62c9\u53d6\u5408\u9002\u7801\u7387\u7684\u6570\u636e\uff0c\u964d\u4f4e\u603b\u4f53\u5e26\u5bbd\u5360\u7528\u3002<\/li>\n<\/ul>\n<h3>4. \u4f7f\u7528HTTP\/2\u3001HTTP\/3\uff08QUIC\uff09\u4e0eTLS\u4f18\u5316\u8fde\u63a5\u590d\u7528<\/h3>\n<p>\u8f83\u65b0\u7684\u4f20\u8f93\u534f\u8bae\u80fd\u964d\u4f4e\u5ef6\u8fdf\u5e76\u63d0\u9ad8\u8fde\u63a5\u590d\u7528\u6548\u7387\uff0c\u51cf\u5c11\u6bcf\u4e2a\u8bf7\u6c42\u7684\u63e1\u624b\u6210\u672c\u548c\u6570\u636e\u5197\u4f59\u3002<\/p>\n<ul>\n<li>\u542f\u7528 HTTP\/2 \u4f7f\u5f97\u5934\u90e8\u538b\u7f29\uff08HPACK\/HTTP2\uff09\u548c\u591a\u8def\u590d\u7528\uff0c\u51cf\u5c11 TCP\/SSL \u63e1\u624b\u6570\u91cf\u3002<\/li>\n<li>\u90e8\u7f72 HTTP\/3\uff08\u57fa\u4e8e QUIC\uff09\u5728\u9ad8\u4e22\u5305\u6216\u8de8\u56fd\u94fe\u8def\u4e0b\u8868\u73b0\u66f4\u597d\uff0c\u80fd\u964d\u4f4e\u91cd\u4f20\u5bfc\u81f4\u7684\u989d\u5916\u5e26\u5bbd\u3002<\/li>\n<li>\u542f\u7528 TLS \u4f1a\u8bdd\u6062\u590d\u3001OCSP stapling \u4e0e\u5408\u9002\u7684\u8bc1\u4e66\u94fe\uff0c\u63d0\u9ad8\u63e1\u624b\u6548\u7387\u5e76\u907f\u514d\u91cd\u590d\u8bc1\u4e66\u4e0b\u8f7d\u3002<\/li>\n<\/ul>\n<h3>5. \u5206\u5757\u3001\u65ad\u70b9\u7eed\u4f20\u4e0e\u8303\u56f4\u8bf7\u6c42\uff08Range Requests\uff09\u4f18\u5316\u5927\u6587\u4ef6\u5206\u53d1<\/h3>\n<p>\u5bf9\u4e8e\u8f6f\u4ef6\u5206\u53d1\u3001\u955c\u50cf\u6216\u5927\u5a92\u4f53\u6587\u4ef6\uff0c\u5408\u7406\u5229\u7528\u8303\u56f4\u8bf7\u6c42\u548c\u5206\u5757\u4f20\u8f93\u53ef\u4ee5\u63d0\u5347\u5e76\u53d1\u5229\u7528\u7387\u5e76\u63a7\u5236\u5355\u5ba2\u6237\u7aef\u5e26\u5bbd\u5360\u7528\u3002<\/p>\n<ul>\n<li>\u652f\u6301 HTTP Range\uff0c\u7ed3\u5408 CDN \u7684\u5206\u7247\u7f13\u5b58\u7b56\u7565\uff0c\u80fd\u628a\u70ed\u95e8\u5206\u7247\u7f13\u5b58\u5230\u8fb9\u7f18\uff0c\u964d\u4f4e\u5168\u6587\u4ef6\u56de\u6e90\u3002<\/li>\n<li>\u91c7\u7528 P2P \u8fb9\u7f18\u52a0\u901f\uff08\u90e8\u5206 CDN \u63d0\u4f9b\uff09\u6216\u591a\u6e90\u52a0\u901f\uff0c\u53ef\u5728\u540c\u5730\u57df\u7528\u6237\u95f4\u51cf\u8f7b\u5e26\u5bbd\u538b\u529b\u3002<\/li>\n<\/ul>\n<h3>6. \u9884\u53d6\u3001\u9884\u70ed\uff08Prefetch\/Pre-warm\uff09\u4e0ePush\u7b56\u7565<\/h3>\n<p>\u9884\u70ed\u7b56\u7565\u9002\u7528\u4e8e\u53d1\u5e03\u6d3b\u52a8\u6216\u70ed\u70b9\u5185\u5bb9\uff0c\u907f\u514d\u6539\u7248\u6216\u5927\u4fc3\u671f\u95f4\u4ea7\u751f\u5927\u91cf\u56de\u6e90\u5e26\u5bbd\u6fc0\u589e\u3002<\/p>\n<ul>\n<li>\u5728\u9884\u671f\u9ad8\u5cf0\u524d\u4f7f\u7528 CDN API \u6279\u91cf\u9884\u70ed\u5173\u952e\u8d44\u6e90\u5230\u6307\u5b9a POP\u3002<\/li>\n<li>\u5bf9\u5173\u952e\u5c0f\u8d44\u6e90\u53ef\u5229\u7528 HTTP\/2 Server Push\uff08\u4f46\u9700\u8c28\u614e\uff0c\u53ef\u80fd\u5bfc\u81f4\u6d6a\u8d39\uff09\u6216 Link: rel=prefetch \u6765\u63d0\u793a\u6d4f\u89c8\u5668\u63d0\u524d\u52a0\u8f7d\u3002<\/li>\n<\/ul>\n<h3>7. \u6d41\u91cf\u667a\u80fd\u8def\u7531\u4e0e POP \u7b56\u7565\uff08Cost-aware Routing\uff09<\/h3>\n<p>\u901a\u8fc7\u667a\u80fd\u8def\u7531\u4e0e\u6309\u9700\u9009\u62e9 POP\uff0c\u53ef\u4ee5\u5728\u6027\u80fd\u4e0e\u6210\u672c\u4e4b\u95f4\u53d6\u5f97\u5e73\u8861\u3002<\/p>\n<ul>\n<li>\u5c06\u4e0d\u540c\u533a\u57df\u6d41\u91cf\uff08\u4f8b\u5982\u6765\u81ea\u9999\u6e2f\u3001\u97e9\u56fd\u3001\u65e5\u672c\u3001\u65b0\u52a0\u5761\u7684\u7528\u6237\uff09\u7ed1\u5b9a\u5230\u5bf9\u5e94\u533a\u57df POP\uff0c\u51cf\u5c11\u8de8\u6d0b\u56de\u6e90\u4e0e\u4e2d\u8f6c\u3002<\/li>\n<li>\u4f7f\u7528\u591a CDN 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