{"id":210003,"date":"2025-10-24T03:57:00","date_gmt":"2025-10-23T19:57:00","guid":{"rendered":"https:\/\/www.server.hk\/blog\/210003\/"},"modified":"2025-10-24T03:57:01","modified_gmt":"2025-10-23T19:57:01","slug":"cdn-235","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/210003\/","title":{"rendered":"CDN\u7f13\u5b58\u5237\u65b0\u5b9e\u6218\uff1a7\u5927\u7b56\u7565\u4e0e\u5e38\u89c1\u9677\u9631\u4e00\u7f51\u6253\u5c3d"},"content":{"rendered":"<p>\u5728\u5168\u7403\u5316\u7684\u7f51\u7edc\u90e8\u7f72\u4e2d\uff0cCDN\uff08\u5185\u5bb9\u5206\u53d1\u7f51\u7edc\uff09\u662f\u63d0\u5347\u7f51\u7ad9\u6027\u80fd\u3001\u964d\u4f4e\u6e90\u7ad9\u538b\u529b\u3001\u6539\u5584\u7528\u6237\u4f53\u9a8c\u7684\u5173\u952e\u7ec4\u4ef6\u3002\u7136\u800c\uff0c\u7f13\u5b58\u662f\u628a\u53cc\u5203\u5251\uff1a\u4e00\u65b9\u9762\u52a0\u901f\u4ea4\u4ed8\uff0c\u53e6\u4e00\u65b9\u9762\u5bfc\u81f4\u5185\u5bb9\u66f4\u65b0\u4e0d\u53ca\u65f6\u6216\u4e00\u81f4\u6027\u95ee\u9898\u3002\u672c\u6587\u4ece\u539f\u7406\u5230\u5b9e\u6218\uff0c\u6df1\u5165\u5256\u6790CDN\u7f13\u5b58\u5237\u65b0\uff08Purge\/Invalidate\/Invalidate vs. Cache-Busting\uff09\u4e03\u5927\u7b56\u7565\u4e0e\u5e38\u89c1\u9677\u9631\uff0c\u5e2e\u52a9\u7ad9\u957f\u3001\u4f01\u4e1a\u4e0e\u5f00\u53d1\u8005\u6784\u5efa\u53ef\u9760\u3001\u53ef\u63a7\u7684\u7f13\u5b58\u5237\u65b0\u673a\u5236\u3002<\/p>\n<h2>\u4e00\u3001\u7f13\u5b58\u5237\u65b0\u57fa\u7840\u539f\u7406\u56de\u987e<\/h2>\n<p>\u5728\u6df1\u5165\u7b56\u7565\u524d\uff0c\u5148\u56de\u987e\u51e0\u4e2a\u5173\u952e\u6982\u5ff5\uff1a<\/p>\n<ul>\n<li><strong>TTL\uff08Time To Live\uff09<\/strong>\uff1a\u8fb9\u7f18\u8282\u70b9\u7f13\u5b58\u8d44\u6e90\u7684\u9ed8\u8ba4\u8fc7\u671f\u65f6\u95f4\u3002<\/li>\n<li><strong>Cache-Control<\/strong>\u54cd\u5e94\u5934\uff1a\u63a7\u5236\u7f13\u5b58\u884c\u4e3a\uff0c\u5e38\u7528\u503c\u6709 max-age\u3001s-maxage\u3001no-cache\u3001no-store\u3001must-revalidate \u7b49\u3002<\/li>\n<li><strong>ETag \/ Last-Modified<\/strong>\uff1a\u7528\u4e8e\u6761\u4ef6\u8bf7\u6c42\uff08If-None-Match \/ If-Modified-Since\uff09\uff0c\u652f\u6301\u534f\u5546\u7f13\u5b58\u4e0e\u8282\u7701\u5e26\u5bbd\u3002<\/li>\n<li><strong>\u7f13\u5b58\u952e\uff08Cache Key\uff09<\/strong>\uff1aCDN\u7528\u4ee5\u533a\u5206\u4e0d\u540c\u7f13\u5b58\u5bf9\u8c61\u7684\u6807\u8bc6\uff0c\u901a\u5e38\u7531 URL\u3001Query String\u3001\u8bf7\u6c42\u5934\uff08\u5982 Host\u3001Accept-Encoding\uff09\u3001Cookies \u7b49\u7ec4\u6210\u3002<\/li>\n<li><strong>\u8f6f\u5237\u65b0 vs \u786c\u5237\u65b0<\/strong>\uff1a\u8f6f\u5237\u65b0\u5e38\u6307\u4f7f\u7f13\u5b58\u5bf9\u8c61\u53d8\u4e3a\u8fc7\u671f\uff08revalidate\uff09\uff0c\u800c\u786c\u5237\u65b0\uff08purge \/ invalidate\uff09\u5219\u76f4\u63a5\u79fb\u9664\u8fb9\u7f18\u7f13\u5b58\u5bf9\u8c61\u3002<\/li>\n<\/ul>\n<h2>\u4e8c\u3001\u4e03\u5927\u5b9e\u6218\u7b56\u7565\u8be6\u89e3<\/h2>\n<h3>1. \u5408\u7406\u7684 TTL \u7b56\u7565\u4e0e\u5206\u5c42\u7f13\u5b58<\/h3>\n<p>\u4e0d\u662f\u6240\u6709\u8d44\u6e90\u90fd\u5e94\u8bbe\u4e3a\u957f\u671f\u7f13\u5b58\u3002\u9759\u6001\u8d44\u6e90\uff08JS\/CSS\/\u56fe\u7247\uff09\u53ef\u91c7\u7528\u8f83\u957f\u7684 TTL\uff08\u4f8b\u5982 7 \u5929\u6216\u66f4\u957f\uff09\uff0c\u800c HTML \u9875\u9762\u53ef\u8bbe\u7f6e\u8f83\u77ed TTL \u6216\u4f7f\u7528\u534f\u5546\u7f13\u5b58\u3002\u7ed3\u5408\u8fb9\u7f18\u4e0e\u8fd1\u6e90\u7684\u5206\u5c42\u7f13\u5b58\uff08Edge Cache + Origin Shield\uff09\uff0c\u80fd\u51cf\u5c11\u5bf9\u6e90\u7ad9\u7684\u5e76\u53d1\u6253\u51fb\u5e76\u63d0\u9ad8\u53ef\u7528\u6027\u3002<\/p>\n<h3>2. \u5229\u7528 Cache-Control \u4e0e\u534f\u5546\u7f13\u5b58\u51cf\u5c11\u5f3a\u5236\u5237\u65b0<\/h3>\n<p>\u901a\u8fc7\u8bbe\u7f6e <code>Cache-Control: s-maxage<\/code> \u7ed9 CDN \u8fb9\u7f18\u8282\u70b9\u5355\u72ec\u63a7\u5236\u65f6\u6548\uff0c\u914d\u5408 <code>ETag<\/code> \u6216 <code>Last-Modified<\/code>\uff0c\u53ef\u5728\u5185\u5bb9\u672a\u53d8\u66f4\u65f6\u8fd4\u56de 304\uff0c\u8282\u7701\u5e26\u5bbd\u3002\u5bf9\u4e8e API \u6216\u7528\u6237\u4e2a\u6027\u5316\u5185\u5bb9\uff0c\u4f7f\u7528 <code>Vary<\/code>\uff08\u6bd4\u5982 <code>Vary: Cookie<\/code>\uff09\u8c28\u614e\u907f\u514d\u7f13\u5b58\u6c61\u67d3\u3002<\/p>\n<h3>3. \u7248\u672c\u5316\u4e0e Cache-Busting\uff08\u6587\u4ef6\u540d\u7b56\u7565\uff09<\/h3>\n<p>\u5bf9\u9759\u6001\u6587\u4ef6\u91c7\u7528\u6587\u4ef6\u540d\u5e26\u7248\u672c\u53f7\uff08\u4f8b\u5982 app.v1.2.3.js \u6216 app.20251023.js\uff09\u662f\u6700\u53ef\u9760\u7684\u5237\u65b0\u65b9\u6cd5\u3002\u4f18\u70b9\u662f\u65e0\u9700\u8c03\u7528 CDN \u7684\u6e05\u9664\u63a5\u53e3\uff0c\u6d4f\u89c8\u5668\u4e0e CDN \u4f1a\u628a\u65b0 URL \u5f53\u4f5c\u65b0\u5bf9\u8c61\u7f13\u5b58\u3002\u7f3a\u70b9\u662f\u9700\u8981\u6784\u5efa\u6d41\u7a0b\u652f\u6301\u81ea\u52a8\u7248\u672c\u53f7\u6216\u54c8\u5e0c\u5316\u3002<\/p>\n<h3>4. \u4f7f\u7528 Surrogate Keys \/ Tagging \u6279\u91cf\u5931\u6548<\/h3>\n<p>\u8bb8\u591a CDN\uff08\u5982 Fastly\u3001Cloudflare \u7b49\uff09\u652f\u6301\u4e3a\u5bf9\u8c61\u6253\u6807\u7b7e\uff08Surrogate-Key\uff09\uff0c\u53d1\u9001 purge \u8bf7\u6c42\u65f6\u53ef\u4ee5\u6309\u6807\u7b7e\u6279\u91cf\u5931\u6548\u3002\u4f8b\u5982\u535a\u5ba2\u7cfb\u7edf\u4e3a\u6bcf\u7bc7\u6587\u7ae0\u6253\u6807\u7b7e\uff0c\u66f4\u65b0\u6587\u7ae0\u65f6\u53ea\u6e05\u9664\u76f8\u5173\u6807\u7b7e\u800c\u4e0d\u5f71\u54cd\u5168\u7ad9\u3002\u6b64\u65b9\u6cd5\u6bd4\u6309 URL \u6279\u91cf\u6e05\u9664\u66f4\u9ad8\u6548\u3001\u6210\u672c\u66f4\u4f4e\u3002<\/p>\n<h3>5. \u9009\u62e9\u5408\u9002\u7684\u5237\u65b0 API \u4e0e\u8282\u6d41\u7b56\u7565<\/h3>\n<p>CDN \u7684 purge API \u901a\u5e38\u6709\u901f\u7387\u9650\u5236\u4e0e\u5e76\u53d1\u914d\u989d\u3002\u751f\u4ea7\u73af\u5883\u5e94\u5b9e\u73b0\u6392\u961f\u3001\u6279\u5904\u7406\u4e0e\u91cd\u8bd5\u673a\u5236\uff1a\u5c06\u5f85\u6e05\u9664\u8def\u5f84\u5148\u5199\u5165\u961f\u5217\uff08\u5982 Redis\u3001RabbitMQ\uff09\uff0c\u6309\u6279\u8c03\u7528 CDN API\uff0c\u5e76\u8bb0\u5f55\u7ed3\u679c\u3002\u5982\u679c\u9891\u7e41\u53d1\u5e03\uff08\u6301\u7eed\u96c6\u6210\u573a\u666f\uff09\uff0c\u4f18\u5148\u4f7f\u7528\u7248\u672c\u5316\u6216\u6807\u7b7e\u7b56\u7565\uff0c\u907f\u514d\u9010\u6761 purge \u5bfc\u81f4\u88ab\u9650\u6d41\u3002<\/p>\n<h3>6. \u8f6f\u5220\u9664\uff08Soft Purge\uff09\u4e0e\u540e\u5907\u9875\u9762\u7b56\u7565<\/h3>\n<p>\u4e00\u4e9b CDN \u652f\u6301\u8f6f\u5220\u9664\uff1a\u8fb9\u7f18\u5bf9\u8c61\u6807\u8bb0\u4e3a\u8fc7\u671f\uff0c\u4f46\u5728\u5931\u6548\u4f20\u64ad\u524d\u4ecd\u80fd\u63d0\u4f9b\u65e7\u5185\u5bb9\u3002\u7ed3\u5408\u540e\u5907\u9875\u9762\uff08stale-if-error \/ stale-while-revalidate\uff09\u7b56\u7565\uff0c\u53ef\u5728\u6e90\u7ad9\u4e0d\u53ef\u7528\u65f6\u7ee7\u7eed\u4e3a\u7528\u6237\u63d0\u4f9b\u65e7\u5185\u5bb9\uff0c\u964d\u4f4e\u670d\u52a1\u4e2d\u65ad\u98ce\u9669\u3002<\/p>\n<h3>7. \u707e\u96be\u6062\u590d\u4e0e\u76d1\u542c\u5931\u6548\u72b6\u6001<\/h3>\n<p>\u5237\u65b0\u5e76\u4e0d\u662f\u4e00\u6b21\u6027\u64cd\u4f5c\uff1a\u9700\u8981\u76d1\u63a7\u5237\u65b0\u7ed3\u679c\u4e0e\u7f13\u5b58\u547d\u4e2d\u7387\u3002\u6784\u5efa\u81ea\u8bca\u65ad\u811a\u672c\uff0c\u4f8b\u5982\u901a\u8fc7\u8bf7\u6c42\u5e26\u7279\u6b8a header \u7684 URL \u6765\u9a8c\u8bc1\u662f\u5426\u66f4\u65b0\uff0c\u8bfb\u53d6 CDN \u63d0\u4f9b\u7684 purge \u72b6\u6001\u56de\u8c03\u6216 webhook\u3002\u53d1\u751f\u5237\u65b0\u5931\u8d25\u65f6\u5e94\u89e6\u53d1\u544a\u8b66\u5e76\u81ea\u52a8\u91cd\u8bd5\u3002<\/p>\n<h2>\u4e09\u3001\u5e38\u89c1\u9677\u9631\u4e0e\u5b9e\u64cd\u5efa\u8bae<\/h2>\n<h3>1. \u8bef\u5224\u7f13\u5b58\u952e\u5bfc\u81f4\u5237\u65b0\u65e0\u6548<\/h3>\n<p>\u5f88\u591a\u95ee\u9898\u6765\u81ea\u4e8e\u7f13\u5b58\u952e\u4e0d\u4e00\u81f4\uff1a\u4f8b\u5982\u5e26\u6216\u4e0d\u5e26\u5c3e\u90e8\u659c\u6760\u3001\u662f\u5426\u5305\u542b query string\u3001Host \u53d8\u4f53\uff08www \u4e0e\u88f8\u57df\uff09\u3001\u662f\u5426\u542b\u6709 Accept-Encoding\uff08gzip\/brotli\uff09\u6216 Cookie \u7b49\u3002\u5efa\u8bae\uff1a<\/p>\n<ul>\n<li>\u68b3\u7406\u5e76\u56fa\u5b9a\u7f13\u5b58\u952e\u89c4\u5219\uff0c\u5c3d\u91cf\u5728 CDN \u5c42\u505a\u7edf\u4e00\u914d\u7f6e\u3002<\/li>\n<li>\u5bf9 query string \u4f7f\u7528\u767d\u540d\u5355\u6216\u5ffd\u7565\u7b56\u7565\uff0c\u907f\u514d\u65e0\u6cd5\u9884\u6599\u7684\u952e\u7206\u70b8\u3002<\/li>\n<\/ul>\n<h3>2. \u8fc7\u5ea6\u4f9d\u8d56\u5168\u7ad9\u6e05\u9664\uff08Purge All\uff09<\/h3>\n<p>\u5168\u7ad9\u6e05\u9664\u4f1a\u5bfc\u81f4\u7f13\u5b58\u51fb\u7a7f\uff0c\u77ed\u65f6\u95f4\u5185\u6210\u5343\u4e0a\u4e07\u8bf7\u6c42\u56de\u6e90\uff0c\u9020\u6210\u6e90\u7ad9\u538b\u529b\u6fc0\u589e\u3002\u5e94\u4f18\u5148\u4f7f\u7528\u7ec6\u7c92\u5ea6\u6e05\u9664\u6216\u6807\u7b7e\u5316\u6e05\u9664\uff0c\u5e76\u5728\u5fc5\u8981\u65f6\u7ed3\u5408\u6d41\u91cf\u5206\u6d41\u6216\u9650\u6d41\u3002<\/p>\n<h3>3. \u5ffd\u7565 HTTPS\/\u8bc1\u4e66\u4e0e CORS \u95ee\u9898<\/h3>\n<p>\u5237\u65b0\u4e0e\u7f13\u5b58\u884c\u4e3a\u5728 HTTPS \u573a\u666f\u8981\u6ce8\u610f\u8bc1\u4e66\u4e00\u81f4\u6027\uff0c\u8de8\u57df\u8d44\u6e90\u7684\u7f13\u5b58\u4e0e\u5237\u65b0\u8981\u914d\u5408\u6b63\u786e\u7684 CORS \u54cd\u5e94\u5934\uff08\u5982 <code>Access-Control-Allow-Origin<\/code>\uff09\u3002\u5426\u5219\u5373\u4f7f\u5185\u5bb9\u5df2\u66f4\u65b0\uff0c\u6d4f\u89c8\u5668\u53ef\u80fd\u62d2\u7edd\u52a0\u8f7d\u6216\u5c55\u793a\u65e7\u8d44\u6e90\u3002<\/p>\n<h3>4. \u5ffd\u89c6\u7f13\u5b58\u7a7f\u900f\u4e0e\u5e76\u53d1\u5237\u65b0\u7684\u201c\u96ea\u5d29\u201d\u6548\u5e94<\/h3>\n<p>\u540c\u65f6\u5927\u91cf\u8bf7\u6c42\u843d\u5230\u6e90\u7ad9\uff08\u6bd4\u5982\u65b0\u54c1\u4e0a\u7ebf\u3001\u79d2\u6740\u6d3b\u52a8\uff09\u4f1a\u9020\u6210\u7f13\u5b58\u7a7f\u900f\u3002\u5e38\u89c1\u5e94\u5bf9\uff1a\u4f7f\u7528\u540e\u7aef\u901f\u7387\u9650\u5236\u3001\u9501\uff08mutex\uff09\u5728\u751f\u6210\u7f13\u5b58\u65f6\u53ea\u8ba9\u4e00\u53f0\u5b9e\u4f8b\u56de\u6e90\uff0c\u6216\u4f7f\u7528 Origin Shield\/Regional POP \u7f13\u89e3\u5cf0\u503c\u6d41\u91cf\u3002<\/p>\n<h3>5. \u65e5\u5fd7\u4e0e\u76d1\u63a7\u7f3a\u5931\u5bfc\u81f4\u95ee\u9898\u5b9a\u4f4d\u56f0\u96be<\/h3>\n<p>\u6ca1\u6709\u5b8c\u6574\u7684 CDN \u65e5\u5fd7\u4e0e\u6307\u6807\u4f1a\u4f7f\u5237\u65b0\u5931\u8d25\u96be\u4ee5\u8ffd\u8e2a\u3002\u5efa\u8bae\u4fdd\u7559\u8fb9\u7f18\u4e0e\u6e90\u7ad9\u65e5\u5fd7\uff0c\u8bb0\u5f55\u6bcf\u6b21 purge \u8bf7\u6c42\u7684\u54cd\u5e94\u7801\u3001\u65f6\u95f4\u4ee5\u53ca\u76f8\u5e94\u7684\u8d44\u6e90 URL\u3002<\/p>\n<h2>\u56db\u3001\u4e0d\u540c\u573a\u666f\u7684\u5e94\u7528\u4e0e\u4f18\u52bf\u5bf9\u6bd4<\/h2>\n<h3>\u4f01\u4e1a\u5b98\u7f51\u4e0e\u5185\u5bb9\u7ad9\uff08\u65b0\u95fb\u3001\u535a\u5ba2\uff09<\/h3>\n<p>\u7279\u70b9\uff1a\u9891\u7e41\u66f4\u65b0 HTML \u5185\u5bb9\u4f46\u9759\u6001\u8d44\u6e90\u7a33\u5b9a\u3002\u63a8\u8350\u7b56\u7565\uff1aHTML \u4f7f\u7528\u77ed TTL + \u534f\u5546\u7f13\u5b58\uff1b\u9759\u6001\u8d44\u6e90\u4f7f\u7528\u6587\u4ef6\u540d\u7248\u672c\u5316\u3002\u53ef\u914d\u5408 Surrogate-Key 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