{"id":209677,"date":"2025-10-23T20:39:06","date_gmt":"2025-10-23T12:39:06","guid":{"rendered":"https:\/\/www.server.hk\/blog\/209677\/"},"modified":"2025-10-23T20:39:07","modified_gmt":"2025-10-23T12:39:07","slug":"cdn-88","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/209677\/","title":{"rendered":"CDN\u5b9e\u6218\uff1a\u5927\u89c4\u6a21\u56fe\u7247\u5206\u53d1\u7684\u6027\u80fd\u4e0e\u6210\u672c\u4f18\u5316\u5168\u653b\u7565"},"content":{"rendered":"<p>\u5728\u6d77\u91cf\u56fe\u7247\u5206\u53d1\u573a\u666f\u4e0b\uff0cCDN\uff08\u5185\u5bb9\u5206\u53d1\u7f51\u7edc\uff09\u662f\u63d0\u5347\u6027\u80fd\u4e0e\u964d\u4f4e\u6210\u672c\u7684\u6838\u5fc3\u624b\u6bb5\u3002\u9762\u5bf9\u6d77\u91cf\u8bbf\u95ee\u3001\u5168\u7403\u5206\u5e03\u7684\u7528\u6237\uff0c\u4ee5\u53ca\u5bf9\u56fe\u7247\u52a0\u8f7d\u901f\u5ea6\u548c\u5e26\u5bbd\u8d39\u7528\u9ad8\u5ea6\u654f\u611f\u7684\u7ad9\u957f\u3001\u4f01\u4e1a\u4e0e\u5f00\u53d1\u8005\uff0c\u5408\u7406\u8bbe\u8ba1 CDN 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\u63e1\u624b\u65f6\u95f4<\/strong>\uff1a\u5f71\u54cd\u7a33\u5b9a\u6027\u548c\u5b89\u5168\u6027\u3002<\/li>\n<\/ul>\n<h3>\u8fb9\u7f18\u7f13\u5b58\u7b56\u7565<\/h3>\n<p>\u5e38\u89c1\u7f13\u5b58\u63a7\u5236\u7b56\u7565\u5305\u62ec Cache-Control\uff08max-age, s-maxage, public\/private\uff09\u3001Expires\u3001ETag\u3001Last-Modified \u7b49\u3002\u56fe\u7247\u8d44\u6e90\u901a\u5e38\u91c7\u7528\u957f\u7f13\u5b58\uff08\u4f8b\u5982\u4e00\u5e74\uff09\u5e76\u7ed3\u5408\u7248\u672c\u5316\u6587\u4ef6\u540d\uff08\u5982 \/images\/hero.v20251001.jpg\uff09\u6765\u5904\u7406\u66f4\u65b0\u3002\u5bf9\u4e8e\u9700\u8981\u6309\u9700\u5931\u6548\u7684\u8d44\u6e90\uff0c\u53ef\u4f7f\u7528\u77ed\u7f13\u5b58\u52a0\u4e0a CDN \u7684\u5373\u65f6\u6e05\u9664\uff08purge\uff09\u6216\u57fa\u4e8e\u65f6\u95f4\u7684\u8fc7\u671f\u7b56\u7565\u3002<\/p>\n<h3>\u56de\u6e90\u4e0e Origin Shield<\/h3>\n<p>\u5f53\u8fb9\u7f18\u8282\u70b9\u672a\u547d\u4e2d\u7f13\u5b58\u65f6\u4f1a\u56de\u6e90\u83b7\u53d6\u56fe\u7247\u3002\u4f7f\u7528 Origin Shield \u6216\u4e2d\u95f4\u5c42\u7f13\u5b58\u53ef\u4ee5\u628a\u56de\u6e90\u8bf7\u6c42\u96c6\u4e2d\u5230\u67d0\u4e2a POP\uff0c\u4ece\u800c\u51cf\u5c11\u6e90\u7ad9\u76f4\u63a5\u627f\u8f7d\u7684\u5e76\u53d1\u4e0e\u5e26\u5bbd\u5cf0\u503c\uff0c\u9002\u5408\u4f7f\u7528\u9999\u6e2f\u670d\u52a1\u5668\u6216\u7f8e\u56fd\u670d\u52a1\u5668\u4f5c\u4e3a\u6e90\u7ad9\u65f6\u7684\u573a\u666f\u3002<\/p>\n<h2>\u4e8c\u3001\u5927\u89c4\u6a21\u56fe\u7247\u5206\u53d1\u7684\u4f18\u5316\u5b9e\u6218<\/h2>\n<h3>1. \u56fe\u7247\u5b58\u50a8\u4e0e\u6e90\u7ad9\u9009\u62e9<\/h3>\n<p>\u9009\u62e9\u6e90\u7ad9\u4f4d\u7f6e\u4f1a\u5f71\u54cd\u56de\u6e90\u5ef6\u8fdf\u4e0e\u5e26\u5bbd\u6210\u672c\u3002\u5bf9\u4e9a\u592a\u7528\u6237\u5bc6\u96c6\u7684\u7ad9\u70b9\uff0c\u4f7f\u7528\u9999\u6e2f\u670d\u52a1\u5668\u6216\u65e5\u672c\u670d\u52a1\u5668\u4f5c\u4e3a\u6e90\u7ad9\u80fd\u6709\u6548\u51cf\u5c0f RTT\uff1b\u5317\u7f8e\u7528\u6237\u591a\u7684\u7ad9\u70b9\u53ef\u9009\u7f8e\u56fd\u670d\u52a1\u5668\u3002\u5bf9\u4e8e\u7075\u6d3b\u6269\u5c55\u9700\u6c42\uff0c\u9999\u6e2fVPS \u6216\u7f8e\u56fdVPS \u662f\u5e38\u7528\u4f4e\u6210\u672c\u9009\u9879\u3002<\/p>\n<h3>2. \u56fe\u7247\u683c\u5f0f\u4e0e\u538b\u7f29<\/h3>\n<p>\u63a8\u8350\u91c7\u7528\u73b0\u4ee3\u56fe\u7247\u683c\u5f0f\uff08WebP\u3001AVIF\uff09\u5e76\u63d0\u4f9b\u56de\u9000\uff08JPEG\/PNG\uff09\u3002\u5728\u7f16\u7801\u53c2\u6570\u4e0a\u91c7\u53d6\u6709\u635f\u538b\u7f29 + \u8d28\u91cf\u5206\u7ea7\uff08\u4f8b\u5982 hero \u56fe\u8d28\u91cf 70\uff0c\u7f29\u7565\u56fe\u8d28\u91cf 50\uff09\u53ef\u4ee5\u5728\u53ef\u89c6\u5dee\u5f02\u5c0f\u7684\u524d\u63d0\u4e0b\u8282\u7701 30%-70% \u5e26\u5bbd\u3002<\/p>\n<ul>\n<li>\u4f7f\u7528\u65e0\u635f\/\u6709\u635f\u6df7\u5408\u7b56\u7565\uff1a\u91cd\u8981\u5c55\u793a\u56fe\u4f18\u5148\u4fdd\u8bc1\u8d28\u91cf\uff0c\u7f29\u7565\u56fe aggressive \u538b\u7f29\u3002<\/li>\n<li>\u81ea\u52a8\u683c\u5f0f\u534f\u5546\uff1a\u901a\u8fc7 Accept \u8bf7\u6c42\u5934\u6216 CDN \u529f\u80fd\u5728\u8fb9\u7f18\u8fd4\u56de WebP\/AVIF\u3002<\/li>\n<li>\u542f\u7528 Brotli \u5bf9\u6587\u672c\u8d44\u6e90\u538b\u7f29\uff0c\u5bf9\u56fe\u7247\u65e0\u6548\uff0c\u4f46\u5bf9 metadata \u6216\u56fe\u50cf\u63cf\u8ff0\u6709\u6548\u3002<\/li>\n<\/ul>\n<h3>3. \u54cd\u5e94\u5f0f\u56fe\u7247\u4e0e\u6309\u9700\u88c1\u526a\uff08Resize on the fly\uff09<\/h3>\n<p>\u901a\u8fc7 CDN \u6216\u8fb9\u7f18\u51fd\u6570\u5bf9\u56fe\u7247\u8fdb\u884c\u6309\u9700\u88c1\u526a\u4e0e\u7f29\u653e\uff0c\u80fd\u591f\u907f\u514d\u4e3a\u6240\u6709\u5206\u8fa8\u7387\u5b58\u50a8\u5197\u4f59\u56fe\u7247\uff0c\u5e38\u89c1\u505a\u6cd5\uff1a<\/p>\n<ul>\n<li>\u5ba2\u6237\u7aef\u6839\u636e viewport \u8bf7\u6c42\u5408\u9002\u5c3a\u5bf8\uff08srcset + sizes\uff09\u3002<\/li>\n<li>\u670d\u52a1\u7aef\/\u8fb9\u7f18\u6839\u636e URL \u53c2\u6570\u751f\u6210\u6307\u5b9a\u5c3a\u5bf8\u5e76\u7f13\u5b58\uff08\u4f8b\u5982 \/img\/123?w=800&amp;h=600\uff09\u3002<\/li>\n<li>\u8fb9\u7f18\u7f13\u5b58\u957f\u4e45\u4fdd\u7559\u751f\u6210\u7684\u5c3a\u5bf8\u56fe\uff0c\u51cf\u8f7b\u6e90\u7ad9\u538b\u529b\u3002<\/li>\n<\/ul>\n<h3>4. HTTP\/2\u3001HTTP\/3 \u4e0e\u8fde\u63a5\u590d\u7528<\/h3>\n<p>\u542f\u7528 HTTP\/2 \u53ef\u4ee5\u901a\u8fc7\u591a\u8def\u590d\u7528\u3001\u5934\u538b\u7f29\u51cf\u5c11\u8bf7\u6c42\u5ef6\u8fdf\uff1bHTTP\/3\uff08\u57fa\u4e8e QUIC\uff09\u5728\u4e22\u5305\u73af\u5883\u4e0b\u66f4\u7a33\u5b9a\uff0c\u80fd\u663e\u8457\u964d\u4f4e\u79fb\u52a8\u7f51\u7edc\u7684\u6062\u590d\u65f6\u95f4\u3002CDN \u5728\u8fb9\u7f18\u652f\u6301 HTTP\/3 \u53ef\u5e26\u6765\u66f4\u597d\u4f53\u9a8c\uff0c\u7279\u522b\u662f\u8de8\u533a\u57df\u8bbf\u95ee\uff08\u5982\u4ece\u65b0\u52a0\u5761\/\u97e9\u56fd\u5230\u9999\u6e2f\u7684\u8bbf\u95ee\uff09\u3002<\/p>\n<h3>5. TLS \u4f18\u5316<\/h3>\n<p>\u4f7f\u7528\u73b0\u4ee3 TLS \u914d\u7f6e\u3001\u542f\u7528 OCSP stapling\u3001\u542f\u7528 session resumption \u53ef\u51cf\u5c11 TLS \u63e1\u624b\u65f6\u95f4\u3002\u5bf9\u4e8e\u5168\u7403\u5206\u5e03\u7528\u6237\uff0c\u63d0\u524d\u90e8\u7f72\u8bc1\u4e66\u5230\u8fb9\u7f18\u8282\u70b9\uff0c\u4e0e\u57df\u540d\u6ce8\u518c\u7684 DNS \u914d\u7f6e\uff08\u5982 CNAME \u5230 CDN\uff09\u914d\u5408\u53ef\u4fdd\u8bc1\u8bbf\u95ee\u4e00\u81f4\u6027\u3002<\/p>\n<h3>6. \u7f13\u5b58\u51fb\u7a7f\u3001\u96ea\u5d29\u4e0e\u7a7f\u900f\u9632\u62a4<\/h3>\n<p>\u5e94\u5bf9\u70ed\u70b9\u56fe\u7247\u7684\u7a81\u7136\u9ad8\u5e76\u53d1\u8bbf\u95ee\uff0c\u53ef\u4ee5\u91c7\u7528\uff1a<\/p>\n<ul>\n<li>\u7f13\u5b58\u9884\u70ed\uff08warm-up\uff09\u7b56\u7565\uff0c\u63d0\u524d\u628a\u9884\u8ba1\u70ed\u70b9\u8d44\u6e90\u52a0\u8f7d\u5165\u8fb9\u7f18\u8282\u70b9\u3002<\/li>\n<li>\u4e92\u65a5\u9501\u6216\u672c\u5730\u9501\u673a\u5236\u907f\u514d\u540c\u4e00\u65f6\u95f4\u5927\u91cf\u56de\u6e90\u8bf7\u6c42\u3002<\/li>\n<li>\u8bbe\u7f6e\u964d\u7ea7\u56fe\u6216\u4fdd\u5b88\u7684\u77ed\u7f13\u5b58\u7b56\u7565\u914d\u5408\u7194\u65ad\uff0c\u4fdd\u62a4\u6e90\u7ad9\uff08\u6bd4\u5982\u9999\u6e2f\u670d\u52a1\u5668\u77ed\u65f6\u95f4\u5185\u54cd\u5e94 503 \u65f6\u63d0\u4f9b\u5360\u4f4d\u56fe\uff09\u3002<\/li>\n<\/ul>\n<h2>\u4e09\u3001\u6210\u672c\u4f18\u5316\u4e0e\u8ba1\u8d39\u6a21\u578b\u5206\u6790<\/h2>\n<h3>\u5e26\u5bbd vs \u8bf7\u6c42\u6570\u7684\u6743\u8861<\/h3>\n<p>CDN \u8ba1\u8d39\u901a\u5e38\u7531\u5e26\u5bbd\uff08GB\uff09\u548c\u8bf7\u6c42\u6570\uff08\u4e07\u6b21\/\u767e\u4e07\u6b21\uff09\u7ec4\u6210\uff0c\u4e0d\u540c\u5382\u5546\u4fa7\u91cd\u70b9\u4e0d\u540c\u3002\u4f18\u5316\u7b56\u7565\u5305\u62ec\uff1a<\/p>\n<ul>\n<li>\u901a\u8fc7\u66f4\u9ad8\u6bd4\u4f8b\u7684\u7f13\u5b58\u547d\u4e2d\u7387\u6765\u964d\u4f4e\u5e26\u5bbd\u56de\u6e90\u3002<\/li>\n<li>\u5408\u5e76\u5c0f\u56fe\u7247\u4e3a\u96ea\u78a7\u56fe\u6216\u4f7f\u7528 Base64\uff08\u4ec5\u5bf9\u6781\u5c11\u6570\u5c0f\u8d44\u6e90\u6709\u6548\uff09\u4ee5\u51cf\u5c11\u8bf7\u6c42\u6570\uff0c\u4f46\u9700\u6ce8\u610f\u589e\u52a0\u54cd\u5e94\u4f53\u5927\u5c0f\u3002<\/li>\n<li>\u5408\u7406\u8bbe\u7f6e cache-control\uff0c\u51cf\u5c11\u4e0d\u5fc5\u8981\u7684 revalidation 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