\u5728\u5168\u7403\u5316\u4e0e\u79fb\u52a8\u5316\u52a0\u901f\u7684\u4eca\u5929\uff0c\u7f51\u7ad9\u548c\u5e94\u7528\u7684\u6027\u80fd\u76f4\u63a5\u5f71\u54cd\u7528\u6237\u4f53\u9a8c\u4e0e\u4e1a\u52a1\u8f6c\u5316\u3002\u901a\u8fc7\u5408\u7406\u8bbe\u8ba1\u4e0e\u843d\u5730 CDN\uff08\u5185\u5bb9\u5206\u53d1\u7f51\u7edc\uff09\u4f18\u5316\u7b56\u7565\uff0c\u53ef\u4ee5\u663e\u8457\u964d\u4f4e\u5ef6\u8fdf\u3001\u63d0\u5347\u53ef\u7528\u6027\u5e76\u51cf\u8f7b\u6e90\u7ad9\u538b\u529b\u3002\u672c\u6587\u9762\u5411\u7ad9\u957f\u3001\u4f01\u4e1a\u7528\u6237\u4e0e\u5f00\u53d1\u8005\uff0c\u6df1\u5165\u8bb2\u89e3 CDN \u7684\u539f\u7406\u3001\u5e38\u89c1\u5e94\u7528\u573a\u666f\u3001\u6280\u672f\u7ec6\u8282\u4e0e\u6700\u7ec8\u843d\u5730\u7684\u5b9e\u64cd\u5efa\u8bae\uff0c\u5e76\u7ed3\u5408\u8de8\u533a\u57df\u90e8\u7f72\uff08\u5982\u9999\u6e2f\u670d\u52a1\u5668\u3001\u7f8e\u56fd\u670d\u52a1\u5668\u3001\u9999\u6e2fVPS\u3001\u7f8e\u56fdVPS\u3001\u65e5\u672c\u670d\u52a1\u5668\u3001\u97e9\u56fd\u670d\u52a1\u5668\u3001\u65b0\u52a0\u5761\u670d\u52a1\u5668\uff09\u4e0e\u57df\u540d\u6ce8\u518c\u3001\u6d77\u5916\u670d\u52a1\u5668\u7b49\u5b9e\u9645\u9009\u578b\u8003\u91cf\uff0c\u5e2e\u52a9\u4f60\u5efa\u7acb\u53ef\u89c2\u6d4b\u3001\u53ef\u6269\u5c55\u7684\u52a0\u901f\u4f53\u7cfb\u3002<\/p>\n
CDN \u7684\u6838\u5fc3\u601d\u8def\u662f\u5c06\u5185\u5bb9\u7f13\u5b58\u5230\u8ddd\u79bb\u7528\u6237\u66f4\u8fd1\u7684\u8fb9\u7f18\u8282\u70b9\uff08POPs\uff09\uff0c\u4ece\u800c\u51cf\u5c11\u7f51\u7edc\u8df3\u6570\u4e0e\u56de\u6e90\u5ef6\u8fdf\u3002\u5176\u5173\u952e\u7ec4\u4ef6\u5305\u62ec\uff1a\u8fb9\u7f18\u8282\u70b9\u7f13\u5b58\u3001\u5168\u5c40\u6d41\u91cf\u8c03\u5ea6\uff08GSLB\/Anycast\/DNS\uff09\u3001\u56de\u6e90\u7b56\u7565\u3001\u8bc1\u4e66\u4e0e\u5b89\u5168\u5c42\uff08WAF\u3001DDoS \u9632\u62a4\uff09\u3001\u76d1\u63a7\u4e0e\u7edf\u8ba1\u7cfb\u7edf\u3002<\/p>\n
\u7f13\u5b58\u547d\u4e2d\u7387\u76f4\u63a5\u51b3\u5b9a\u52a0\u901f\u6548\u679c\u3002CDN \u652f\u6301\u591a\u79cd\u7f13\u5b58\u63a7\u5236\u65b9\u5f0f\uff1a\u901a\u8fc7 HTTP \u5934\u7684 Cache-Control\uff08max-age\u3001s-maxage\u3001public\/private\u3001no-cache\u3001no-store\uff09\u548c ETag\/Last-Modified \u5b9e\u73b0\u65f6\u95f4\u4e0e\u534f\u5546\u7f13\u5b58\u3002\u5bf9\u52a8\u6001\u4e0e\u4e2a\u6027\u5316\u5185\u5bb9\uff0c\u5e38\u7528\u7b56\u7565\u5305\u62ec\uff1a\u8def\u5f84\u5206\u7ea7\u7f13\u5b58\uff08static vs dynamic\uff09\u3001\u7f13\u5b58\u952e\uff08\u542b query string\u3001cookie\uff09\u3001\u8fb9\u7f18\u53d8\u91cf\u7f13\u5b58\uff08Edge Side Includes\uff09\u4ee5\u53ca\u7f13\u5b58\u9884\u70ed\/\u9884\u53d6\uff08prefetch\/purge\uff09\u3002<\/p>\n
\u6d41\u91cf\u8c03\u5ea6\u6709\u4e24\u7c7b\u4e3b\u6d41\u65b9\u6848\uff1a\u57fa\u4e8e Anycast \u7684 BGP \u8def\u7531\u4e0e\u57fa\u4e8e DNS \u7684\u667a\u80fd\u89e3\u6790\u3002Anycast \u66f4\u9002\u5408\u9700\u8981\u5feb\u901f\u8def\u7531\u6536\u655b\u7684\u573a\u666f\uff0cDNS \u89e3\u6790\u5219\u53ef\u4ee5\u57fa\u4e8e\u5730\u7406\u4f4d\u7f6e\u3001\u5ef6\u8fdf\u548c\u8d1f\u8f7d\u505a\u66f4\u7cbe\u7ec6\u7684\u7b56\u7565\u3002\u5bf9\u4e8e\u8de8\u533a\u57df\u7528\u6237\uff08\u4f8b\u5982\u9999\u6e2f\u3001\u65e5\u672c\u3001\u97e9\u56fd\u3001\u65b0\u52a0\u5761\u3001\u7f8e\u56fd\u7684\u8bbf\u95ee\uff09\uff0c\u9700\u8981\u4fdd\u8bc1 CDN POP \u8986\u76d6\u5e76\u7ed3\u5408\u56de\u6e90\u4f18\u5316\uff0c\u907f\u514d\u51fa\u73b0\u201c\u6700\u8fd1\u7684\u8fb9\u7f18\u8282\u70b9\u65e0\u6cd5\u56de\u6e90\u5bfc\u81f4\u56de\u6e90\u8de8\u6d0b\u201d\u7684\u53cd\u6a21\u5f0f\u3002<\/p>\n
\u73b0\u4ee3 CDN \u96c6\u6210 TLS \u7ec8\u6b62\u3001HTTP\/2 \u4e0e HTTP\/3\uff08QUIC\uff09\uff0c\u63d0\u5347\u5e76\u53d1\u4e0e\u9996\u5b57\u8282\u65f6\u95f4\uff08TTFB\uff09\u3002\u540c\u65f6\uff0cWAF \u4e0e DDoS \u9632\u62a4\u9700\u8981\u4e0e\u7f13\u5b58\u7b56\u7565\u534f\u540c\uff1a\u4f8b\u5982\u5bf9\u9759\u6001\u8d44\u6e90\u9ed8\u8ba4\u5f00\u653e\u957f\u7f13\u5b58\uff0c\u5bf9 API \u6216\u767b\u5f55\u8def\u5f84\u542f\u7528\u4e25\u683c\u6821\u9a8c\u4e0e\u901f\u7387\u9650\u5236\u3002\u8bc1\u4e66\u7ba1\u7406\u53ef\u4ee5\u901a\u8fc7 CDN \u63d0\u4f9b\u7684\u81ea\u52a8\u7b7e\u53d1\u6216\u91c7\u7528\u81ea\u6709\u8bc1\u4e66\uff0c\u6ce8\u610f OCSP\/CRL \u4e0e TLS \u4f1a\u8bdd\u590d\u7528\u5bf9\u6027\u80fd\u7684\u5f71\u54cd\u3002<\/p>\n
\u5bf9\u4e8e\u9759\u6001\u6587\u4ef6\uff08HTML\u3001CSS\u3001JS\u3001\u56fe\u7247\u3001\u5b57\u4f53\u7b49\uff09\uff0c\u6700\u4f73\u5b9e\u8df5\u662f\u957f\u7f13\u5b58\u5e76\u7ed3\u5408\u7248\u672c\u5316<\/strong>\uff08\u5982\u5728\u6587\u4ef6\u540d\u6216 query \u4e2d\u52a0\u5165\u54c8\u5e0c\uff09\u3002\u5bf9\u56fe\u7247\u91c7\u7528 WebP\/Brotli \u538b\u7f29\u548c\u54cd\u5e94\u5f0f\u56fe\u7247\uff08srcset\uff09\u51cf\u5c11\u4f20\u8f93\u5b57\u8282\u3002\u8fb9\u7f18\u538b\u7f29\uff08gzip\/brotli\uff09\u4e0e\u8d44\u6e90\u5408\u5e76\uff08\u5c3d\u91cf\u51cf\u5c11\u5c0f\u6587\u4ef6\uff09\u4e5f\u80fd\u663e\u8457\u964d\u4f4e\u8bf7\u6c42\u6570\u4e0e\u5ef6\u8fdf\u3002<\/p>\n \u52a8\u6001 API \u4e0d\u5b9c\u957f\u65f6\u95f4\u7f13\u5b58\uff0c\u4f46\u53ef\u4ee5\u91c7\u7528\u5206\u6bb5\u7f13\u5b58\uff1a\u5bf9 idempotent \u7684 GET \u8bf7\u6c42\u8bbe\u7f6e\u77ed\u7f13\u5b58\uff08\u4f8b\u5982 60s\uff09\uff0c\u5e76\u542f\u7528 stale-while-revalidate \u6216 Edge Side Cache\uff08\u5982\u679c CDN \u652f\u6301\uff09\u3002\u9488\u5bf9\u9ad8\u5e76\u53d1\u7684\u70ed\u70b9\u6570\u636e\uff0c\u914d\u5408 Origin Shield \u6216 Tiered Cache \u51cf\u5c11\u6e90\u7ad9 QPS\uff0c\u907f\u514d\u5728\u9ad8\u5e76\u53d1\u573a\u666f\u4e0b\u6e90\u7ad9\u8fc7\u8f7d\u3002<\/p>\n \u89c6\u9891\u548c\u5927\u6587\u4ef6\u5e38\u7528\u5206\u6bb5\u4f20\u8f93\uff08HLS\/DASH\uff09\u914d\u5408 CDN \u5206\u53d1\uff0c\u9700\u5173\u6ce8\u8fb9\u7f18\u8282\u70b9\u7684\u5e26\u5bbd\u4e0e\u5e76\u53d1\u80fd\u529b\u3002\u5efa\u8bae\u542f\u7528\u65ad\u70b9\u7eed\u4f20\u4e0e 206 Partial Content \u652f\u6301\uff0c\u5408\u7406\u914d\u7f6e\u7f13\u5b58\u63a7\u5236\u4e0e\u8303\u56f4\u8bf7\u6c42\u7b56\u7565\u3002<\/p>\n \u8861\u91cf CDN \u7684\u5173\u952e\u6307\u6807\u5305\u62ec\uff1a\u7f13\u5b58\u547d\u4e2d\u7387\u3001TTFB\u3001\u9996\u5c4f\u65f6\u95f4\uff08First Contentful Paint\uff09\u3001\u4e0b\u8f7d\u65f6\u95f4\u3001P95\/P99 \u54cd\u5e94\u65f6\u5ef6\u3001\u5e26\u5bbd\u5229\u7528\u7387\u4e0e\u56de\u6e90\u6d41\u91cf\u3002\u5e38\u7528\u76d1\u63a7\u624b\u6bb5\u6709\uff1a\u5408\u6210\u76d1\u6d4b\uff08Synthetic Tests\uff09\u3001\u771f\u5b9e\u7528\u6237\u76d1\u6d4b\uff08RUM\uff09\u3001\u65e5\u5fd7\u5206\u6790\u4e0e\u8fb9\u7f18\u57cb\u70b9\u3002<\/p>\n \u63a8\u8350\u5efa\u7acb\u544a\u8b66\u89c4\u5219\uff0c\u4f8b\u5982\u7f13\u5b58\u547d\u4e2d\u7387\u4f4e\u4e8e\u9608\u503c\u3001\u56de\u6e90 5xx \u589e\u52a0\u6216\u67d0\u533a\u57df\u5ef6\u8fdf\u5f02\u5e38\u3002\u8de8\u533a\u57df\u4e1a\u52a1\u65f6\uff0c\u5e94\u7279\u522b\u5173\u6ce8\u9999\u6e2f\u3001\u4e1c\u4eac\u3001\u9996\u5c14\u3001\u65b0\u52a0\u5761\u4e0e\u7f8e\u56fd\u7b49\u8282\u70b9\u7684\u5dee\u5f02\uff0c\u7ed3\u5408 Traceroute \u548c MTR \u5b9a\u4f4d\u7f51\u7edc\u74f6\u9888\u3002<\/p>\n \u4ee5\u4e0b\u4e3a\u843d\u5730\u65f6\u5e38\u89c1\u7684\u914d\u7f6e\u8981\u70b9\uff08\u4ee5 Nginx + CDN \u573a\u666f\u4e3a\u4f8b\uff09\uff1a<\/p>\n \u5728 Nginx \u6e90\u7ad9\u5e38\u89c1\u7684\u4e00\u884c\u914d\u7f6e\u601d\u8def\uff08\u6587\u672c\u63cf\u8ff0\uff0c\u65e0\u4ee3\u7801\u5757\uff09\uff1a\u8bbe\u7f6e expires \u6216 add_header Cache-Control\uff0c\u5f00\u542f gzip_static \u5e76\u8bbe\u7f6e etag off\uff08\u5f53\u4f7f\u7528\u7248\u672c\u5316\u6587\u4ef6\u65f6\uff09\uff0c\u4e3a API \u8bbe\u7f6e\u5408\u7406\u7684 proxy_cache_key \u5e76\u914d\u7f6e proxy_cache_valid\u3002<\/p>\n \u9009\u62e9 CDN \u4e0e\u6e90\u7ad9\u6240\u5728\u4f4d\u7f6e\u662f\u4e92\u76f8\u5173\u8054\u7684\u51b3\u7b56\uff1a<\/p>\n \u57df\u540d\u6ce8\u518c\u4e0e DNS \u7684\u9009\u62e9\u4e5f\u4f1a\u5f71\u54cd\u89e3\u6790\u65f6\u5ef6\uff0c\u5efa\u8bae\u5c06\u57df\u540d\u6ce8\u518c\u4e0e DNS \u670d\u52a1\u5206\u522b\u8bc4\u4f30\uff0c\u4f7f\u7528\u652f\u6301\u5168\u7403 Anycast \u7684 DNS \u670d\u52a1\u80fd\u964d\u4f4e\u9996\u5305\u65f6\u5ef6\u3002<\/p>\n \u5b9e\u9645\u843d\u5730\u5e38\u9047\u5230\u7684\u95ee\u9898\u5305\u62ec\uff1a\u7f13\u5b58\u7a7f\u900f\uff08\u7f13\u5b58\u547d\u4e2d\u7387\u4f4e\uff09\u3001\u56de\u6e90\u5ef6\u8fdf\u9ad8\u3001\u8bc1\u4e66\u4e0d\u5339\u914d\u3001\u4e0d\u540c\u533a\u57df\u547d\u4e2d\u7387\u5dee\u5f02\u8fc7\u5927\u3002\u63a8\u8350\u7684\u6392\u67e5\u6d41\u7a0b\uff1a<\/p>\n \u9009\u8d2d CDN \u4e0e\u914d\u5957\u670d\u52a1\u5668\u65f6\uff0c\u9700\u8981\u7efc\u5408\u8003\u91cf\uff1a\u6d41\u91cf\u6210\u672c\u3001\u8bf7\u6c42\u8ba1\u8d39\u3001\u533a\u57df\u8986\u76d6\u3001\u56de\u6e90\u5e26\u5bbd\u4e0e SLA\u3002\u5bf9\u4e8e\u9884\u7b97\u6709\u9650\u4f46\u9700\u8986\u76d6\u4e1c\u4e9a\u4e0e\u4e1c\u5357\u4e9a\u7684\u7ad9\u70b9\uff0c\u53ef\u4ee5\u4f18\u5148\u9009\u62e9\u5728\u9999\u6e2f\u670d\u52a1\u5668\u6216\u9999\u6e2fVPS \u505a\u6e90\u7ad9\uff0c\u914d\u5408\u8986\u76d6\u65e5\u672c\u3001\u97e9\u56fd\u3001\u65b0\u52a0\u5761 POP \u7684 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