{"id":210027,"date":"2025-10-24T04:15:37","date_gmt":"2025-10-23T20:15:37","guid":{"rendered":"https:\/\/www.server.hk\/blog\/210027\/"},"modified":"2025-10-24T04:15:38","modified_gmt":"2025-10-23T20:15:38","slug":"cdn-247","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/210027\/","title":{"rendered":"CDN\u7f13\u5b58\u5237\u65b0\u7b56\u7565\u4f18\u5316\u5b9e\u6218\uff1a\u63d0\u5347\u547d\u4e2d\u7387\u3001\u964d\u4f4e\u5ef6\u8fdf\u4e0e\u6210\u672c"},"content":{"rendered":"<p>\u5728\u5168\u7403\u8bbf\u95ee\u5206\u5e03\u65e5\u76ca\u5206\u6563\u7684\u65f6\u4ee3\uff0cCDN\uff08\u5185\u5bb9\u5206\u53d1\u7f51\u7edc\uff09\u6210\u4e3a\u7f51\u7ad9\u6027\u80fd\u548c\u6210\u672c\u4f18\u5316\u7684\u5173\u952e\u4e00\u73af\u3002\u5bf9\u4e8e\u7ad9\u957f\u3001\u4f01\u4e1a\u7528\u6237\u548c\u5f00\u53d1\u8005\u6765\u8bf4\uff0c\u5355\u7eaf\u5c06\u8d44\u6e90\u4ea4\u7531 CDN \u627f\u8f7d\u5e76\u4e0d\u80fd\u89e3\u51b3\u6240\u6709\u95ee\u9898\uff0c<strong>\u5408\u7406\u7684\u7f13\u5b58\u5237\u65b0\u7b56\u7565\u76f4\u63a5\u51b3\u5b9a\u7f13\u5b58\u547d\u4e2d\u7387\u3001\u7528\u6237\u611f\u77e5\u5ef6\u8fdf\u4ee5\u53ca\u8fd0\u7ef4\u548c\u5e26\u5bbd\u6210\u672c<\/strong>\u3002\u672c\u6587\u4ece\u539f\u7406\u5230\u5b9e\u6218\uff0c\u7ed3\u5408\u591a\u533a\u57df\u90e8\u7f72\uff08\u5982\u9999\u6e2f\u670d\u52a1\u5668\u3001\u7f8e\u56fd\u670d\u52a1\u5668\u3001\u65e5\u672c\u670d\u52a1\u5668\u7b49\uff09\u4e0e\u4e0d\u540c\u573a\u666f\uff0c\u8be6\u8ff0\u5982\u4f55\u8bbe\u8ba1\u4e0e\u4f18\u5316 CDN \u7f13\u5b58\u5237\u65b0\u7b56\u7565\uff0c\u4ee5\u8fbe\u5230\u964d\u4f4e\u5ef6\u8fdf\u3001\u63d0\u5347\u547d\u4e2d\u4e0e\u8282\u7ea6\u6210\u672c\u7684\u76ee\u6807\u3002<\/p>\n<h2>CDN \u7f13\u5b58\u57fa\u7840\u4e0e\u5e38\u89c1\u75db\u70b9<\/h2>\n<p>\u5728\u6df1\u5165\u7b56\u7565\u4e4b\u524d\uff0c\u5148\u68b3\u7406\u51e0\u4e2a\u6838\u5fc3\u6982\u5ff5\u4e0e\u5e38\u89c1\u95ee\u9898\uff1a<\/p>\n<ul>\n<li><strong>\u7f13\u5b58\u547d\u4e2d\u7387\uff08Cache Hit Ratio\uff09<\/strong>\uff1a\u7528\u6237\u8bf7\u6c42\u88ab CDN \u8fb9\u7f18\u8282\u70b9\u547d\u4e2d\u7684\u6bd4\u4f8b\uff0c\u76f4\u63a5\u5f71\u54cd\u56de\u6e90\u6b21\u6570\u548c\u54cd\u5e94\u5ef6\u8fdf\u3002<\/li>\n<li><strong>TTL\uff08Time To Live\uff09<\/strong>\uff1a\u8d44\u6e90\u5728\u8fb9\u7f18\u8282\u70b9\u4fdd\u7559\u7684\u65f6\u95f4\uff0cTTL \u592a\u77ed\u4f1a\u9891\u7e41\u56de\u6e90\uff0cTTL \u592a\u957f\u5219\u53ef\u80fd\u5bfc\u81f4\u7528\u6237\u770b\u5230\u8fc7\u671f\u5185\u5bb9\u3002<\/li>\n<li><strong>\u7f13\u5b58\u5237\u65b0\uff08Purge\/Invalidate\uff09<\/strong>\uff1a\u5f53\u6e90\u7aef\u8d44\u6e90\u53d8\u66f4\u65f6\uff0c\u5982\u4f55\u8ba9\u8fb9\u7f18\u8282\u70b9\u5c3d\u5feb\u5931\u6548\u5e76\u52a0\u8f7d\u6700\u65b0\u5185\u5bb9\u3002<\/li>\n<li><strong>\u7f13\u5b58\u7a7f\u900f\/\u51fb\u7a7f<\/strong>\uff1a\u9ad8\u5e76\u53d1\u5931\u6548\u6216\u7f13\u5b58\u672a\u547d\u4e2d\u65f6\u5927\u91cf\u8bf7\u6c42\u56de\u6e90\uff0c\u9020\u6210\u6e90\u7ad9\u538b\u529b\u4e0e\u5ef6\u8fdf\u6fc0\u589e\u3002<\/li>\n<\/ul>\n<p>\u75db\u70b9\u901a\u5e38\u4f53\u73b0\u5728\uff1a\u9891\u7e41\u7684\u4eba\u5de5 purge \u5bfc\u81f4\u9ad8\u6210\u672c\u3001\u9759\u6001\u8d44\u6e90\u7248\u672c\u7ba1\u7406\u6df7\u4e71\u3001\u52a8\u6001\u5185\u5bb9\u7684\u7f13\u5b58\u4e0e\u5237\u65b0\u7b56\u7565\u51b2\u7a81\u3001\u4e0d\u540c\u533a\u57df\uff08\u5982\u9999\u6e2fVPS vs \u7f8e\u56fdVPS\uff09\u8bbf\u95ee\u4f53\u9a8c\u5dee\u5f02\u7b49\u3002<\/p>\n<h2>\u539f\u7406\u5c42\u9762\uff1a\u5f71\u54cd\u7f13\u5b58\u884c\u4e3a\u7684\u5173\u952e\u6280\u672f\u70b9<\/h2>\n<h3>HTTP \u7f13\u5b58\u5934\u4e0e\u6761\u4ef6\u8bf7\u6c42<\/h3>\n<p>\u6700\u76f4\u63a5\u7684\u63a7\u5236\u65b9\u5f0f\u662f\u901a\u8fc7 HTTP \u5934\uff1a<\/p>\n<ul>\n<li><strong>Cache-Control<\/strong>\uff1amax-age\u3001s-maxage\u3001public\/private\u3001no-cache\u3001no-store\u3001must-revalidate\u3002s-maxage \u4e13\u7528\u4e8e\u5171\u4eab\u7f13\u5b58\uff08CDN\uff09\uff0c\u4f18\u5148\u7ea7\u9ad8\u4e8e max-age\u3002<\/li>\n<li><strong>Expires<\/strong>\uff1a\u8001\u5f0f\u4f46\u4ecd\u88ab\u652f\u6301\uff0c\u8bbe\u7f6e\u7edd\u5bf9\u8fc7\u671f\u65f6\u95f4\u3002<\/li>\n<li><strong>ETag \u4e0e Last-Modified<\/strong>\uff1a\u914d\u5408 If-None-Match \/ If-Modified-Since \u5b9e\u73b0\u6761\u4ef6 GET\uff0c\u8fb9\u7f18\u8282\u70b9\u6216\u6d4f\u89c8\u5668\u53ef\u5411\u6e90\u7ad9\u8fdb\u884c\u8f7b\u91cf\u9a8c\u8bc1\uff0c\u8fd4\u56de 304 \u51cf\u5c11\u5e26\u5bbd\u3002<\/li>\n<li><strong>Surrogate-Control \u4e0e Surrogate-Key<\/strong>\uff1a\u90e8\u5206 CDN\uff08\u6216\u53cd\u5411\u4ee3\u7406\uff09\u652f\u6301\u7684\u6269\u5c55\u5934\uff0c\u7528\u4e8e\u66f4\u7ec6\u7c92\u5ea6\u7684\u8fb9\u7f18\u884c\u4e3a\u6216\u57fa\u4e8e tag \u7684\u6279\u91cf\u5931\u6548\u3002<\/li>\n<\/ul>\n<p>\u5408\u7406\u7ec4\u5408\u8fd9\u4e9b\u5934\u53ef\u4ee5\u5728\u4e0d\u540c\u8d44\u6e90\u7c7b\u578b\uff08HTML\u3001JS\u3001CSS\u3001\u56fe\u7247\u3001API\uff09\u4e4b\u95f4\u5efa\u7acb\u5dee\u5f02\u5316\u7b56\u7565\u3002<\/p>\n<h3>\u7f13\u5b58\u952e\uff08Cache Key\uff09\u4e0e\u53d8\u4f53<\/h3>\n<p>\u7f13\u5b58\u952e\u51b3\u5b9a\u8fb9\u7f18\u8282\u70b9\u5982\u4f55\u533a\u5206\u4e0d\u540c\u8bf7\u6c42\u3002\u5e38\u89c1\u8981\u70b9\uff1a<\/p>\n<ul>\n<li>\u662f\u5426\u5305\u542b Query String\uff08\u53c2\u6570\u654f\u611f\u8d44\u6e90\u53ef\u5305\u542b\uff0c\u9759\u6001\u8d44\u6e90\u53ef\u5ffd\u7565\uff09<\/li>\n<li>Header \u4f5c\u4e3a\u7f13\u5b58\u7ef4\u5ea6\uff08\u5982 Accept-Encoding\u3001User-Agent\u3001Cookie\uff09\u4f1a\u589e\u52a0\u7f13\u5b58\u788e\u7247\u5316\uff0c\u5efa\u8bae\u53ea\u5728\u5fc5\u8981\u65f6\u542f\u7528\u3002<\/li>\n<li>URL \u91cd\u5199\u4e0e\u7248\u672c\u53f7\uff08versioning\uff09\u7b56\u7565\uff1a\u9759\u6001\u8d44\u6e90\u91c7\u7528\u6587\u4ef6\u540d\u6307\u7eb9\uff08hash\uff09\u662f\u6700\u597d\u5b9e\u8df5\uff0c\u80fd\u7b80\u5316\u5237\u65b0\u5e76\u63d0\u9ad8\u957f\u671f\u547d\u4e2d\u7387\u3002<\/li>\n<\/ul>\n<h3>\u8fb9\u7f18\u8ba1\u7b97\u4e0e ESI\uff08Edge Side Includes\uff09<\/h3>\n<p>\u5bf9\u4e8e HTML \u7247\u6bb5\u7ec4\u5408\u7684\u9875\u9762\uff0c\u53ef\u4ee5\u901a\u8fc7 ESI \u5c06\u53ef\u7f13\u5b58\u4e0e\u4e0d\u53ef\u7f13\u5b58\u90e8\u5206\u5206\u79bb\uff0c\u5728\u8fb9\u7f18\u62fc\u88c5\uff0c\u65e2\u4fdd\u6301\u6574\u4f53\u9875\u9762\u52a0\u901f\uff0c\u53c8\u51cf\u5c11\u9891\u7e41\u56de\u6e90\u3002<\/p>\n<h2>\u5e94\u7528\u573a\u666f\u4e0e\u9488\u5bf9\u6027\u7b56\u7565<\/h2>\n<h3>\u9759\u6001\u8d44\u6e90\uff08JS\/CSS\/\u56fe\u7247\uff09\uff1a\u4ee5\u201c\u957f\u671f\u7f13\u5b58 + \u7248\u672c\u5316 + \u5c11\u91cf\u624b\u52a8\u5237\u65b0\u201d\u4e3a\u4e3b<\/h3>\n<ul>\n<li>\u4e3a\u9759\u6001\u8d44\u6e90\u8bbe\u7f6e\u8f83\u957f\u7684 s-maxage\uff08\u4f8b\u5982 7 \u5929\u5230 1 \u5e74\uff09\uff0c\u5e76\u5728\u6587\u4ef6\u540d\u4e2d\u52a0\u5165 hash\uff08\u4f8b\u5982 asset.abc123.js\uff09\uff0c\u907f\u514d\u9891\u7e41 purge\u3002<\/li>\n<li>\u4f7f\u7528 Cache-Control: immutable \u5bf9\u4e8e\u7248\u672c\u5316\u8d44\u6e90\u662f\u5f3a\u63a8\u8350\uff0c\u6d4f\u89c8\u5668\u4e0e\u8fb9\u7f18\u8282\u70b9\u5728\u9047\u5230\u76f8\u540c URL \u65f6\u53ef\u653e\u5fc3\u957f\u671f\u7f13\u5b58\u3002<\/li>\n<li>\u5f53\u9700\u8981\u56de\u6eda\u6216\u53d1\u5e03\u65b0\u7248\u672c\u65f6\uff0c\u901a\u8fc7\u66f4\u65b0\u6587\u4ef6\u540d\u5b9e\u73b0\u201c\u539f\u5b50\u201d\u5207\u6362\uff0c\u907f\u514d\u6e05\u7406\u5927\u91cf\u8fb9\u7f18\u7f13\u5b58\u3002<\/li>\n<\/ul>\n<h3>\u52a8\u6001\u9875\u9762\uff08\u7528\u6237\u76f8\u5173\u3001\u9891\u7e41\u66f4\u65b0\u5185\u5bb9\uff09\uff1a\u6df7\u5408\u7b56\u7565<\/h3>\n<ul>\n<li>\u5bf9\u6574\u9875\u91c7\u7528\u8f83\u77ed\u7684 TTL\uff08\u4f8b\u5982 30s \u5230 5min\uff09\uff0c\u5e76\u914d\u5408 ETag\/If-Modified-Since \u505a\u6761\u4ef6\u8bf7\u6c42\uff0c\u51cf\u5c11\u5e26\u5bbd\u56de\u6e90\u3002<\/li>\n<li>\u5bf9\u4e0d\u654f\u611f\u7684\u9875\u9762\u7247\u6bb5\u4f7f\u7528\u957f TTL\uff0c\u5e76\u5728\u9875\u9762\u5c42\u62fc\u88c5\uff0c\u964d\u4f4e\u91cd\u590d\u56de\u6e90\u3002<\/li>\n<li>\u5bf9\u4e8e\u9700\u8981\u5373\u65f6\u751f\u6548\u7684\u53d8\u66f4\uff08\u5982\u7ba1\u7406\u5458\u7f16\u8f91\uff09\uff0c\u91c7\u7528\u6807\u7b7e\u5f0f\u5931\u6548\uff08surrogate-key\uff09\u6216\u7cbe\u786e purge API\uff0c\u907f\u514d\u5168\u7ad9\u5237\u65b0\u3002<\/li>\n<\/ul>\n<h3>\u9ad8\u5e76\u53d1\u7a81\u53d1\u573a\u666f\uff08\u7f13\u5b58\u51fb\u7a7f\uff09\u5904\u7406<\/h3>\n<ul>\n<li>\u5f15\u5165\u7f13\u5b58\u9884\u70ed\uff08warming\uff09\uff0c\u5728\u53d1\u5e03\u6216\u9884\u671f\u6d41\u91cf\u4e0a\u5347\u524d\uff0c\u5148\u7531 CI\/CD \u6216\u811a\u672c\u5411\u8fb9\u7f18\u8282\u70b9\u8bf7\u6c42\u76ee\u6807\u8d44\u6e90\uff0c\u5efa\u7acb\u70ed\u7f13\u5b58\u3002<\/li>\n<li>\u5b9e\u73b0\u201c\u4e92\u65a5\u9501\u201d\u6216\u201c\u5ef6\u8fdf\u53cc\u5220\u201d\u7b56\u7565\uff1a\u5f53\u68c0\u6d4b\u5230\u7f13\u5b58\u5931\u6548\u540e\uff0c\u8ba9\u5c11\u91cf\u8bf7\u6c42\u56de\u6e90\u5e76\u66f4\u65b0\u7f13\u5b58\uff0c\u5176\u4ed6\u8bf7\u6c42\u7b49\u5f85\u6216\u4f7f\u7528\u65e7\u7248\u672c\uff08stale-while-revalidate\uff09\u3002<\/li>\n<li>\u4f7f\u7528 CDN \u7684 Origin Shield \u6216\u4e2d\u95f4\u5c42\u7f13\u5b58\u6765\u805a\u5408\u56de\u6e90\u8bf7\u6c42\uff0c\u51cf\u8f7b\u6e90\u7ad9\u538b\u529b\uff0c\u9002\u5408\u8de8\u533a\u57df\u90e8\u7f72\u5982\u9999\u6e2f\u670d\u52a1\u5668\u4e0e\u7f8e\u56fd\u670d\u52a1\u5668\u540c\u65f6\u56de\u6e90\u573a\u666f\u3002<\/li>\n<\/ul>\n<h2>\u5237\u65b0\u7b56\u7565\u7684\u5b9e\u6218\u6280\u5de7\u4e0e\u81ea\u52a8\u5316<\/h2>\n<h3>\u5206\u5c42\u5931\u6548\u4e0e\u5206\u6bb5\u5237\u65b0<\/h3>\n<p>\u907f\u514d\u201c\u5168\u91cf purge\u201d\u3002\u53ef\u4ee5\u4f9d\u636e\u4e1a\u52a1\u7ef4\u5ea6\u6309\u76ee\u5f55\u3001\u6309 tag \u6216\u6309 URL \u524d\u7f00\u5206\u5c42\u5931\u6548\u3002\u4f8b\u5982\u535a\u5ba2\u7cfb\u7edf\u53ea\u9700\u6e05\u9664 \/posts\/123\/*\uff0c\u800c\u4e0d\u662f\u6e05\u7a7a\u6574\u4e2a\u7ad9\u70b9\u3002<\/p>\n<h3>\u4f7f\u7528 Soft Purge \u6216 Stale Policies<\/h3>\n<p>\u90e8\u5206 CDN \u652f\u6301 soft purge\uff08\u6807\u8bb0\u4e3a\u8fc7\u671f\u4f46\u4e0d\u7acb\u5373\u5220\u9664\uff09\u4e0e stale-while-revalidate\/stale-if-error\uff0c\u5141\u8bb8\u8fb9\u7f18\u5728\u56de\u6e90\u5931\u8d25\u6216\u91cd\u65b0\u7f13\u5b58\u671f\u95f4\u7ee7\u7eed\u8fd4\u56de\u65e7\u5185\u5bb9\uff0c\u63d0\u5347\u53ef\u7528\u6027\u5e76\u6291\u5236\u56de\u6e90\u98ce\u66b4\u3002<\/p>\n<h3>API \u81ea\u52a8\u5316\u4e0e\u6743\u9650\u63a7\u5236<\/h3>\n<ul>\n<li>\u5c06 purge \u64cd\u4f5c\u901a\u8fc7 CI\/CD \u4e0e\u6743\u9650\u7ba1\u7406\u81ea\u52a8\u5316\uff1a\u53d1\u5e03\u7cfb\u7edf\u5728\u53d1\u5e03\u6210\u529f\u540e\u89e6\u53d1\u9488\u5bf9\u53d8\u66f4\u6587\u4ef6\u7684 purge \u6216\u4ec5\u66f4\u65b0\u7248\u672c\u5316 URL\u3002<\/li>\n<li>\u5bf9\u5916\u66b4\u9732\u7684 purge API \u8981\u505a\u901f\u7387\u9650\u5236\u4e0e\u9274\u6743\uff0c\u907f\u514d\u88ab\u6ee5\u7528\u9020\u6210\u6210\u672c\u6fc0\u589e\u3002<\/li>\n<\/ul>\n<h3>\u76d1\u63a7\u3001\u5ea6\u91cf\u4e0e\u8fed\u4ee3<\/h3>\n<ul>\n<li>\u76d1\u6d4b\u5173\u952e\u6307\u6807\uff1a\u8fb9\u7f18\u547d\u4e2d\u7387\u3001\u56de\u6e90\u6d41\u91cf\u3001\u56de\u6e90\u54cd\u5e94\u65f6\u95f4\u3001Purge \u8c03\u7528\u9891\u6b21\u4e0e\u6210\u529f\u7387\u3002<\/li>\n<li>\u4f7f\u7528\u65e5\u5fd7\u5206\u6790\uff08\u5982\u8fb9\u7f18\u8bbf\u95ee\u65e5\u5fd7\uff09\u5b9a\u4f4d\u4f4e\u547d\u4e2d\u7387\u8d44\u6e90\uff1a\u901a\u5e38\u662f\u56e0\u4e3a\u8fc7\u4e8e\u7ec6\u7c92\u5ea6\u7684\u7f13\u5b58\u952e\u6216\u643a\u5e26\u591a\u4f59 Cookie\u3002<\/li>\n<li>\u901a\u8fc7 A\/B \u6d4b\u8bd5\u4e0d\u540c TTL 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