{"id":209585,"date":"2025-10-23T18:15:17","date_gmt":"2025-10-23T10:15:17","guid":{"rendered":"https:\/\/www.server.hk\/blog\/209585\/"},"modified":"2025-10-23T18:15:18","modified_gmt":"2025-10-23T10:15:18","slug":"cdn-49","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/209585\/","title":{"rendered":"\u65b0\u95fb\u7f51\u7ad9\u79d2\u5f00\u79d8\u7c4d\uff1aCDN\u52a0\u901f\u7684\u5173\u952e\u7b56\u7565"},"content":{"rendered":"<p>\u5728\u65b0\u95fb\u7c7b\u7f51\u7ad9\u91cc\uff0c\u201c\u6beb\u79d2\u7ea7\u201d\u7684\u9875\u9762\u6253\u5f00\u4f53\u9a8c\u76f4\u63a5\u5173\u7cfb\u5230\u7528\u6237\u7559\u5b58\u4e0e\u5e7f\u544a\u53d8\u73b0\u3002\u76f8\u6bd4\u9759\u6001\u5185\u5bb9\uff0c\u65b0\u95fb\u7ad9\u70b9\u5305\u542b\u5927\u91cf\u5b9e\u65f6\u66f4\u65b0\u3001\u56fe\u7247\u4e0e\u89c6\u9891\u3001\u591a\u6e90\u5e7f\u544a\u548c\u4e2a\u6027\u5316\u7ec4\u4ef6\uff0c\u5bf9\u7f13\u5b58\u7b56\u7565\u548c\u7f51\u7edc\u4f20\u8f93\u63d0\u51fa\u66f4\u9ad8\u8981\u6c42\u3002\u672c\u6587\u5c06\u56f4\u7ed5 CDN \u52a0\u901f\u7684\u5173\u952e\u7b56\u7565\uff0c\u7ed3\u5408\u5b9e\u9645\u573a\u666f\u4e0e\u90e8\u7f72\u7ec6\u8282\uff0c\u5e2e\u52a9\u7ad9\u957f\u3001\u4f01\u4e1a\u7528\u6237\u4e0e\u5f00\u53d1\u8005\u4e3a\u65b0\u95fb\u7f51\u7ad9\u5b9e\u73b0\u201c\u79d2\u5f00\u201d\u4f53\u9a8c\uff0c\u540c\u65f6\u517c\u987e\u5b89\u5168\u4e0e\u53ef\u7ef4\u62a4\u6027\u3002<\/p>\n<h2>CDN \u52a0\u901f\u7684\u57fa\u672c\u539f\u7406<\/h2>\n<p>CDN\uff08\u5185\u5bb9\u5206\u53d1\u7f51\u7edc\uff09\u901a\u8fc7\u5728\u5168\u7403\u591a\u4e2a\u8fb9\u7f18\u8282\u70b9\uff08POP\uff09\u7f13\u5b58\u5185\u5bb9\uff0c\u7f29\u77ed\u7528\u6237\u5230\u6700\u8fd1\u8282\u70b9\u7684\u7f51\u7edc\u8ddd\u79bb\uff0c\u964d\u4f4e\u56de\u6e90\uff08origin\uff09\u8bf7\u6c42\uff0c\u4ece\u800c\u51cf\u5c11\u65f6\u5ef6\u4e0e\u5e26\u5bbd\u6d88\u8017\u3002\u5bf9\u4e8e\u65b0\u95fb\u7f51\u7ad9\u800c\u8a00\uff0c\u5173\u952e\u5728\u4e8e\u628a\u53ef\u7f13\u5b58\u7684\u9759\u6001\u8d44\u6e90\uff08\u5982\u56fe\u7247\u3001CSS\u3001JS\u3001\u89c6\u9891\u5207\u7247\uff09\u4ee5\u53ca\u53ef\u77ed\u671f\u7f13\u5b58\u7684\u52a8\u6001\u9875\u9762\uff08\u5982\u9996\u9875\u3001\u9891\u9053\u9875\uff09\u653e\u5728\u8fb9\u7f18\u8282\u70b9\uff0c\u540c\u65f6\u5bf9\u5f3a\u5b9e\u65f6\u6027\u8981\u6c42\u7684\u5185\u5bb9\u91c7\u7528\u5408\u7406\u7684\u56de\u6e90\u4e0e\u63a8\u9001\u7b56\u7565\u3002<\/p>\n<h3>\u8fb9\u7f18\u7f13\u5b58\u4e0e\u56de\u6e90\u673a\u5236<\/h3>\n<ul>\n<li>Origin Pull vs Origin Push\uff1a\u5927\u591a\u6570\u65b0\u95fb\u7ad9\u91c7\u7528 <strong>origin pull<\/strong>\uff08\u6309\u9700\u62c9\u53d6\uff09\u6a21\u5f0f\uff0c\u8fb9\u7f18\u8282\u70b9\u5728\u9996\u6b21\u8bf7\u6c42\u65f6\u5411\u6e90\u7ad9\u83b7\u53d6\u5e76\u7f13\u5b58\u3002\u5bf9\u6bcf\u65e5\u56fa\u5b9a\u53d1\u5e03\u65f6\u95f4\u70b9\u7684\u5927\u91cf\u5185\u5bb9\u53ef\u4ee5\u8003\u8651 <strong>origin push<\/strong> \u6216 pre-warm\uff08\u9884\u70ed\uff09\u4ee5\u907f\u514d\u51b7\u542f\u52a8\u6d41\u91cf\u5cf0\u503c\u3002<\/li>\n<li>\u7f13\u5b58\u952e\uff08Cache Key\uff09\u7b56\u7565\uff1a\u5b9a\u4e49\u7f13\u5b58\u952e\u65f6\u8981\u8003\u8651\u534f\u8bae\u3001\u4e3b\u673a\u540d\u3001\u8def\u5f84\u3001\u67e5\u8be2\u5b57\u7b26\u4e32\u4e0e Cookie\u3002\u5bf9\u65b0\u95fb\u7ad9\uff0c\u5e94\u5bf9\u5e7f\u544a\u53c2\u6570\u6216\u8ddf\u8e2a\u53c2\u6570\u505a\u89c4\u8303\u5316\uff08normalize\uff09\uff0c\u4ee5\u907f\u514d\u76f8\u540c\u8d44\u6e90\u88ab\u91cd\u590d\u7f13\u5b58\u3002<\/li>\n<li>TTL \u4e0e\u7f13\u5b58\u5206\u5c42\uff1a\u5bf9\u9996\u9875\u3001\u9891\u9053\u9875\u91c7\u7528\u77ed TTL\uff08\u5982 10-60 \u79d2\uff09\u7684\u5fae\u7f13\u5b58\uff08microcaching\uff09\uff0c\u5bf9\u6587\u7ae0\u9875\u91c7\u7528\u8f83\u957f TTL\uff08\u5982 5-30 \u5206\u949f\uff09\uff0c\u540c\u65f6\u542f\u7528\u8fb9\u7f18\u4e0e\u56de\u6e90\u7684\u591a\u7ea7\u7f13\u5b58\uff08Edge + Origin Shield\uff09\u51cf\u8f7b\u6e90\u7ad9\u538b\u529b\u3002<\/li>\n<\/ul>\n<h3>\u52a8\u6001\u5185\u5bb9\u4e0e\u5b9e\u65f6\u66f4\u65b0\u7684\u5904\u7406<\/h3>\n<p>\u65b0\u95fb\u7ad9\u70b9\u9700\u5e73\u8861\u201c\u5b9e\u65f6\u6027\u201d\u4e0e\u201c\u7f13\u5b58\u6548\u7387\u201d\u3002\u5e38\u7528\u6280\u672f\u5305\u62ec\uff1a<\/p>\n<ul>\n<li><strong>Stale-while-revalidate \/ stale-if-error<\/strong>\uff1a\u5141\u8bb8\u8fb9\u7f18\u8282\u70b9\u5728\u540e\u53f0\u5237\u65b0\u7f13\u5b58\u7684\u540c\u65f6\u7ee7\u7eed\u8fd4\u56de\u65e7\u5185\u5bb9\uff0c\u4fdd\u8bc1\u9ad8\u53ef\u7528\u6027\u4e0e\u4f4e\u5ef6\u8fdf\u3002<\/li>\n<li><strong>Cache Invalidation\uff08\u4e3b\u52a8\u6e05\u9664\uff09<\/strong>\uff1a\u901a\u8fc7 API \u6216 Purge \u8bf7\u6c42\u5728\u53d1\u5e03\u6216\u4fee\u6539\u6587\u7ae0\u65f6\u7acb\u5373\u6e05\u9664\u76f8\u5173\u7f13\u5b58\uff0c\u652f\u6301\u6309 URL\u3001Tag\u3001\u751a\u81f3\u6b63\u5219\u5339\u914d\u6e05\u9664\u3002<\/li>\n<li><strong>Keyed Invalidation<\/strong>\uff1a\u4e3a\u5185\u5bb9\u7cfb\u7edf\u7ef4\u62a4 tag\u3001category\u3001author \u7b49\u7ef4\u5ea6\uff0c\u53d1\u5e03\u65f6\u53ea\u6e05\u9664\u53d7\u5f71\u54cd\u7684\u7f13\u5b58\u8303\u56f4\uff0c\u907f\u514d\u5168\u7ad9\u6296\u52a8\u3002<\/li>\n<\/ul>\n<h2>\u6027\u80fd\u4f18\u5316\u7ec6\u8282<\/h2>\n<p>\u628a\u63e1\u4ee5\u4e0b\u7ec6\u8282\uff0c\u53ef\u4ee5\u5728\u7f51\u7edc\u548c\u6d4f\u89c8\u5668\u7aef\u8fdb\u4e00\u6b65\u538b\u7f29\u9996\u5b57\u8282\u65f6\u95f4\uff08TTFB\uff09\u4e0e\u9875\u9762\u6e32\u67d3\u65f6\u95f4\u3002<\/p>\n<h3>\u4f20\u8f93\u5c42\u4e0e\u534f\u8bae\u4f18\u5316<\/h3>\n<ul>\n<li><strong>\u542f\u7528 HTTP\/2 \u4e0e HTTP\/3\uff08QUIC\uff09<\/strong>\uff1a\u51cf\u5c11\u63e1\u624b\u4e0e\u591a\u8def\u590d\u7528\u63d0\u5347\u5e76\u53d1\u4e0b\u8f7d\u6548\u7387\uff0c\u5c24\u5176\u5bf9\u5927\u91cf\u5c0f\u8d44\u6e90\uff08\u56fe\u6807\u3001\u811a\u672c\uff09\u663e\u8457\u52a0\u901f\u3002<\/li>\n<li><strong>TLS \u4f18\u5316<\/strong>\uff1a\u4f7f\u7528\u77ed\u800c\u5408\u7406\u7684\u8bc1\u4e66\u94fe\uff0c\u542f\u7528 OCSP Stapling\uff0c\u5c3d\u91cf\u4f7f\u7528 0-RTT\uff08\u5728\u652f\u6301\u7684\u60c5\u51b5\u4e0b\uff09\u6765\u964d\u4f4e\u63e1\u624b\u5ef6\u8fdf\u3002<\/li>\n<li><strong>Anycast \u4e0e\u5feb\u901f DNS<\/strong>\uff1aCDN \u8282\u70b9\u91c7\u7528 Anycast \u5e7f\u544a\u8def\u7531\uff0c\u914d\u5408\u4f4e\u5ef6\u8fdf\u7684 DNS\uff08\u4f8b\u5982\u542f\u7528 EDNS \u548c DNS prefetch\uff09\uff0c\u80fd\u8fdb\u4e00\u6b65\u7f29\u77ed\u89e3\u6790\u4e0e\u8def\u7531\u65f6\u95f4\u3002<\/li>\n<\/ul>\n<h3>\u5185\u5bb9\u4f53\u79ef\u4e0e\u683c\u5f0f\u4f18\u5316<\/h3>\n<ul>\n<li><strong>\u56fe\u7247\u4f18\u5316<\/strong>\uff1a\u4f7f\u7528 WEBP\/AVIF \u7b49\u73b0\u4ee3\u683c\u5f0f\u3001\u5f00\u542f\u54cd\u5e94\u5f0f\u56fe\u7247\uff08srcset\uff09\u548c\u5ef6\u8fdf\u52a0\u8f7d\uff08lazy-loading\uff09\uff0c\u5e76\u5728\u8fb9\u7f18\u8fdb\u884c\u81ea\u52a8\u683c\u5f0f\u8f6c\u6362\u4ee5\u5339\u914d\u5ba2\u6237\u7aef\u80fd\u529b\u3002<\/li>\n<li><strong>\u89c6\u9891\u5904\u7406<\/strong>\uff1a\u91c7\u7528 HLS\/DASH \u5206\u7247\u5e76\u901a\u8fc7 CDN \u505a\u5206\u53d1\uff0c\u542f\u7528 ABR\uff08\u81ea\u9002\u5e94\u6bd4\u7279\u7387\uff09\u4e0e\u8fb9\u7f18\u7f13\u5b58\u89c6\u9891\u5207\u7247\uff0c\u51cf\u5c11\u56de\u6e90\u8bf7\u6c42\u3002<\/li>\n<li><strong>\u538b\u7f29\u7b97\u6cd5<\/strong>\uff1a\u4f18\u5148\u4f7f\u7528 Brotli\uff08\u5728\u652f\u6301\u7684\u6d4f\u89c8\u5668\u548c CDN \u4e0b\uff09\u5bf9\u6587\u672c\u7c7b\u8d44\u6e90\u8fdb\u884c\u538b\u7f29\uff0c\u8bbe\u7f6e\u5408\u9002\u7684\u538b\u7f29\u9608\u503c\uff08\u4f8b\u5982 &gt; 1KB\uff09\u4ee5\u907f\u514d\u538b\u7f29\u5f00\u9500\u5927\u4e8e\u6536\u76ca\u3002<\/li>\n<\/ul>\n<h3>\u8d44\u6e90\u5408\u5e76\u4e0e\u9884\u8fde\u63a5<\/h3>\n<ul>\n<li>\u5408\u7406\u5408\u5e76\u548c\u7cbe\u7b80 CSS\/JS\uff0c\u907f\u514d\u4e0d\u5fc5\u8981\u7684\u7b2c\u4e09\u65b9\u811a\u672c\u963b\u585e\u6e32\u67d3\u3002<\/li>\n<li>\u4f7f\u7528 <strong>preconnect\u3001dns-prefetch\u3001preload<\/strong> \u6807\u7b7e\u63d0\u524d\u5efa\u7acb\u5230\u5173\u952e\u57df\uff08\u5982\u5e7f\u544a\u3001\u5206\u6790\u6216\u5a92\u4f53 CDN\uff09\u7684\u8fde\u63a5\uff0c\u7f29\u77ed\u7b2c\u4e00\u6b21\u8bf7\u6c42\u5ef6\u8fdf\u3002<\/li>\n<\/ul>\n<h2>\u5b89\u5168\u6027\u4e0e\u9ad8\u53ef\u7528\u7b56\u7565<\/h2>\n<p>\u65b0\u95fb\u7ad9\u901a\u5e38\u662f DDoS \u653b\u51fb\u4e0e\u6076\u610f\u722c\u866b\u7684\u76ee\u6807\uff0cCDN \u5728\u5b89\u5168\u9632\u62a4\u4e0e\u53ef\u7528\u6027\u4fdd\u969c\u4e0a\u80fd\u53d1\u6325\u5173\u952e\u4f5c\u7528\u3002<\/p>\n<h3>\u8fb9\u7f18\u5b89\u5168\u529f\u80fd<\/h3>\n<ul>\n<li><strong>WAF\uff08Web Application Firewall\uff09<\/strong>\uff1a\u5728\u8fb9\u7f18\u8fc7\u6ee4\u5e38\u89c1\u653b\u51fb\uff08SQLi\u3001XSS\u3001RCE\uff09\uff0c\u5e76\u80fd\u57fa\u4e8e\u901f\u7387\u9650\u6d41\u4fdd\u62a4\u53d1\u5e03\u9ad8\u5cf0\u671f\u7684\u56de\u6e90\u3002<\/li>\n<li><strong>\u8eab\u4efd\u9a8c\u8bc1\u4e0e\u7b7e\u540d URL<\/strong>\uff1a\u5bf9\u4ed8\u4ed8\u8d39\u5185\u5bb9\u6216\u53d7\u9650\u89c6\u9891\uff0c\u4f7f\u7528\u5e26\u8fc7\u671f\u7b7e\u540d\u7684 URL \u6216 Token \u9a8c\u8bc1\uff0c\u5728\u8fb9\u7f18\u9a8c\u8bc1\u540e\u624d\u5141\u8bb8\u4e0b\u8f7d\u3002<\/li>\n<li><strong>Bot \u7ba1\u7406\u4e0e\u901f\u7387\u9650\u5236<\/strong>\uff1a\u8bc6\u522b\u5e76\u7f13\u89e3\u6076\u610f\u722c\u866b\uff0c\u5141\u8bb8\u53ef\u4fe1\u722c\u866b\uff08\u5982\u641c\u7d22\u5f15\u64ce\uff09\u88ab\u4f8b\u5916\u5904\u7406\u3002<\/li>\n<\/ul>\n<h3>\u5bb9\u707e\u4e0e\u591a\u5730\u57df\u90e8\u7f72<\/h3>\n<p>\u4e3a\u63d0\u9ad8\u6297\u6545\u969c\u80fd\u529b\uff0c\u5efa\u8bae\u8fdb\u884c\u591a\u70b9\u90e8\u7f72\uff1a<\/p>\n<ul>\n<li>\u4e3b\u6e90\u7ad9\u53ef\u90e8\u7f72\u5728\u53ef\u9760\u7684\u9999\u6e2f\u670d\u52a1\u5668\u6216\u7f8e\u56fd\u670d\u52a1\u5668\u7b49\u591a\u5730\u57df\u56de\u6e90\u96c6\u5408\u4e2d\uff0c\u7ed3\u5408\u667a\u80fd\u8def\u7531\u4e0e\u5065\u5eb7\u68c0\u67e5\u8fdb\u884c\u81ea\u52a8\u5207\u6362\u3002<\/li>\n<li>\u5bf9\u4e8e\u66f4\u9ad8\u53ef\u7528\u6027\u9700\u6c42\uff0c\u53ef\u4ee5\u90e8\u7f72\u591a\u6d3b\u67b6\u6784\uff08Active-Active\uff09\uff0c\u5728\u4e0d\u540c\u5730\u57df\uff08\u9999\u6e2f\u3001\u7f8e\u56fd\u3001\u65e5\u672c\u3001\u97e9\u56fd\u3001\u65b0\u52a0\u5761\uff09\u8bbe\u7f6e\u6e90\u7ad9\u5e76\u4f7f\u7528 CDN \u7684\u8d1f\u8f7d\u5e73\u8861\u6216 GeoDNS\u3002<\/li>\n<\/ul>\n<h2>\u5e94\u7528\u573a\u666f\u4e0e\u4f18\u52bf\u5bf9\u6bd4<\/h2>\n<p>\u4e0d\u540c\u7c7b\u578b\u7684\u65b0\u95fb\u7ad9\u70b9\u5bf9 CDN \u7684\u5177\u4f53\u7b56\u7565\u6709\u6240\u5dee\u5f02\uff1a<\/p>\n<h3>\u672c\u5730\u5316\u5f3a\u3001\u53d7\u4f17\u96c6\u4e2d\uff08\u4f8b\u5982\u9999\u6e2f\/\u4e1c\u4e9a\uff09<\/h3>\n<ul>\n<li>\u4f18\u5148\u9009\u62e9\u5728\u9999\u6e2f\u3001\u4e1c\u4eac\u3001\u9996\u5c14\u548c\u65b0\u52a0\u5761\u6709\u4e30\u5bcc POP \u7684 CDN\uff0c\u786e\u4fdd\u4e9a\u592a\u533a\u57df\u5185\u7684\u7528\u6237\u83b7\u5f97\u6700\u4f4e\u5ef6\u8fdf\u3002<\/li>\n<li>\u53ef\u5c06\u6e90\u7ad9\u653e\u5728\u9999\u6e2f\u670d\u52a1\u5668\u6216\u9999\u6e2fVPS\uff0c\u4ee5\u51cf\u5c11\u8fb9\u7f18\u5230\u6e90\u7684\u56de\u6e90\u65f6\u5ef6\u3002<\/li>\n<\/ul>\n<h3>\u5168\u7403\u5206\u53d1\uff08\u56fd\u9645\u53d7\u4f17\uff09<\/h3>\n<ul>\n<li>\u9700\u8981\u5728\u5317\u7f8e\u3001\u6b27\u6d32\u3001\u4e9a\u592a\u7b49\u5730\u5747\u6709 POP\uff0c\u7ed3\u5408\u7f8e\u56fd\u670d\u52a1\u5668\u6216\u7f8e\u56fdVPS \u4f5c\u4e3a\u56de\u6e90\u8282\u70b9\u53ef\u4ee5\u63d0\u5347\u7f8e\u6d32\u7528\u6237\u4f53\u9a8c\u3002<\/li>\n<li>\u4f7f\u7528 Anycast\u3001\u5168\u7403\u8d1f\u8f7d\u5747\u8861\u4e0e\u667a\u80fd\u8def\u7531\u80fd\u663e\u8457\u964d\u4f4e\u8de8\u6d0b\u5ef6\u8fdf\u5f71\u54cd\u3002<\/li>\n<\/ul>\n<h3>\u5c0f\u578b\u539f\u521b\u5a92\u4f53\u6216\u4e2a\u4eba\u7ad9\u957f<\/h3>\n<ul>\n<li>\u6210\u672c\u654f\u611f\u65f6\uff0c\u53ef\u5c06\u57df\u540d\u6ce8\u518c\u4e0e\u670d\u52a1\u5668\u6258\u7ba1\u5728\u6210\u672c\u4e0e\u5ef6\u8fdf\u5e73\u8861\u70b9\uff0c\u5229\u7528\u5171\u4eab CDN \u670d\u52a1\u51cf\u5c11\u8fd0\u7ef4\u538b\u529b\u3002<\/li>\n<li>\u9999\u6e2fVPS \u6216 \u65b0\u52a0\u5761\u670d\u52a1\u5668 \u662f\u8f83\u597d\u7684\u8d77\u70b9\uff0c\u5728\u4e9a\u592a\u5feb\u901f\u5206\u53d1\u540c\u65f6\u517c\u987e\u6210\u672c\u3002<\/li>\n<\/ul>\n<h2>\u9009\u8d2d\u4e0e\u90e8\u7f72\u5efa\u8bae<\/h2>\n<p>\u9009\u62e9 CDN \u4e0e\u6e90\u7ad9\u90e8\u7f72\u65f6\uff0c\u5efa\u8bae\u5173\u6ce8\u4ee5\u4e0b\u6280\u672f\u4e0e\u670d\u52a1\u6307\u6807\uff1a<\/p>\n<ul>\n<li><strong>POP 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