{"id":209977,"date":"2025-10-24T02:17:43","date_gmt":"2025-10-23T18:17:43","guid":{"rendered":"https:\/\/www.server.hk\/blog\/209977\/"},"modified":"2025-10-24T02:17:44","modified_gmt":"2025-10-23T18:17:44","slug":"cdn-222","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/209977\/","title":{"rendered":"CDN\u7f13\u5b58\u4f18\u5316\u5b9e\u6218\uff1a\u8fd0\u7ef4\u63d0\u5347\u547d\u4e2d\u7387\u4e0e\u964d\u672c\u6307\u5357"},"content":{"rendered":"<p>\u5728\u5168\u7403\u5316\u548c\u79fb\u52a8\u5316\u6d6a\u6f6e\u4e0b\uff0cCDN\uff08\u5185\u5bb9\u5206\u53d1\u7f51\u7edc\uff09\u5df2\u6210\u4e3a\u7f51\u7ad9\u4e0e\u5e94\u7528\u964d\u4f4e\u5ef6\u8fdf\u3001\u51cf\u8f7b\u6e90\u7ad9\u538b\u529b\u548c\u63a7\u5236\u5e26\u5bbd\u6210\u672c\u7684\u5173\u952e\u6280\u672f\u3002\u5bf9\u4e8e\u7ad9\u957f\u3001\u8fd0\u7ef4\u4e0e\u5f00\u53d1\u8005\u800c\u8a00\uff0c<strong>\u63d0\u5347CDN\u7f13\u5b58\u547d\u4e2d\u7387<\/strong>\u4e0d\u4ec5\u80fd\u6539\u5584\u7528\u6237\u4f53\u9a8c\uff0c\u8fd8\u80fd\u663e\u8457\u964d\u4f4e\u6d77\u5916\u5e26\u5bbd\u8d39\u7528\u4e0e\u6e90\u7ad9\u8d1f\u8f7d\u3002\u672c\u6587\u4ee5\u5b9e\u6218\u89d2\u5ea6\uff0c\u8be6\u89e3\u7f13\u5b58\u539f\u7406\u3001\u4f18\u5316\u7b56\u7565\u3001\u76d1\u63a7\u65b9\u6cd5\u4e0e\u9009\u8d2d\u5efa\u8bae\uff0c\u9002\u7528\u4e8e\u4f7f\u7528\u9999\u6e2f\u670d\u52a1\u5668\u3001\u7f8e\u56fd\u670d\u52a1\u5668\u6216\u90e8\u7f72\u9999\u6e2fVPS\u3001\u7f8e\u56fdVPS\u7b49\u573a\u666f\u7684\u7ad9\u70b9\u3002<\/p>\n<h2>CDN\u7f13\u5b58\u539f\u7406\u4e0e\u5173\u952e\u6307\u6807<\/h2>\n<p>\u7406\u89e3\u7f13\u5b58\u547d\u4e2d\u7387\u4f18\u5316\u7684\u7b2c\u4e00\u6b65\u662f\u638c\u63e1\u57fa\u672c\u539f\u7406\u4e0e\u8861\u91cf\u6307\u6807\u3002<\/p>\n<h3>\u7f13\u5b58\u5de5\u4f5c\u6d41\u7b80\u8ff0<\/h3>\n<ul>\n<li>\u5ba2\u6237\u7aef\u8bf7\u6c42\u5230\u6700\u8fd1\u7684\u8fb9\u7f18\u8282\u70b9\uff08POP\uff09\u3002<\/li>\n<li>\u8fb9\u7f18\u8282\u70b9\u6839\u636e\u7f13\u5b58\u952e\u68c0\u67e5\u672c\u5730\u7f13\u5b58\u662f\u5426\u5b58\u5728\u6709\u6548\u8d44\u6e90\u3002<\/li>\n<li>\u82e5\u547d\u4e2d\uff08cache hit\uff09\uff0c\u76f4\u63a5\u8fd4\u56de\u7f13\u5b58\u5185\u5bb9\uff1b\u82e5\u672a\u547d\u4e2d\uff08cache miss\uff09\uff0c\u5411\u4e0a\u6e38\uff08\u901a\u5e38\u662f\u8fd0\u8425\u5546\u7684\u4e2d\u95f4\u7f13\u5b58\u6216\u6e90\u7ad9\uff09\u53d1\u8d77\u8bf7\u6c42\uff0c\u5e76\u5c06\u54cd\u5e94\u5b58\u5165\u7f13\u5b58\u3002<\/li>\n<\/ul>\n<h3>\u5173\u952e\u6307\u6807<\/h3>\n<ul>\n<li><strong>\u547d\u4e2d\u7387\uff08Cache Hit Ratio\uff09<\/strong>\uff1a\u547d\u4e2d\u8bf7\u6c42\u6570 \/ \u603b\u8bf7\u6c42\u6570\uff0c\u76f4\u63a5\u53cd\u6620\u7f13\u5b58\u6548\u679c\u3002<\/li>\n<li>\u8fb9\u7f18\u547d\u4e2d\u7387\u4e0e\u56de\u6e90\u7387\uff1a\u533a\u5206\u8fb9\u7f18\u8282\u70b9\u547d\u4e2d\u548c\u4e2d\u95f4\u5c42\uff08Tiered Cache\uff09\u547d\u4e2d\u3002<\/li>\n<li>\u5e26\u5bbd\u8282\u7701\uff08Bandwidth Savings\uff09\uff1a\u901a\u8fc7\u7f13\u5b58\u907f\u514d\u7684\u6e90\u7ad9\u6d41\u91cf\u5360\u6bd4\u3002<\/li>\n<li>\u54cd\u5e94\u65f6\u5ef6\u4e0e\u9519\u8bef\u7387\uff1a\u9ad8\u547d\u4e2d\u7387\u901a\u5e38\u964d\u4f4e\u5ef6\u8fdf\u548c\u56de\u6e90\u9519\u8bef\u3002<\/li>\n<\/ul>\n<h2>\u5b9e\u6218\u4f18\u5316\u7b56\u7565<\/h2>\n<p>\u4e0b\u9762\u6309\u9759\u6001\u8d44\u6e90\u3001\u52a8\u6001\u5185\u5bb9\u3001\u7f13\u5b58\u952e\u4e0e\u7b56\u7565\u3001\u7f13\u5b58\u66f4\u65b0\/\u5931\u6548\u56db\u65b9\u9762\uff0c\u7ed9\u51fa\u53ef\u843d\u5730\u7684\u4f18\u5316\u63aa\u65bd\u3002<\/p>\n<h3>\u9759\u6001\u8d44\u6e90\u7f13\u5b58\u4f18\u5316<\/h3>\n<ul>\n<li>\u5408\u7406\u8bbe\u7f6eHTTP\u7f13\u5b58\u5934\uff1a\u5bf9\u7248\u672c\u5316\u9759\u6001\u8d44\u6e90\uff08\u5982\u5e26\u7248\u672c\u53f7\u7684CSS\/JS\u3001\u5e26content hash\u7684\u6587\u4ef6\uff09\u4f7f\u7528 <code>Cache-Control: public, max-age=31536000, immutable<\/code>\u3002\u8fd9\u80fd\u8ba9\u8fb9\u7f18\u8282\u70b9\u957f\u671f\u7f13\u5b58\uff0c\u63d0\u5347\u547d\u4e2d\u7387\u3002<\/li>\n<li>\u5bf9\u5e38\u53d8\u8d44\u6e90\uff08\u5982\u9996\u9875\u3001\u914d\u7f6e\u6587\u4ef6\uff09\u8bbe\u7f6e\u8f83\u77edTTL\u6216\u4f7f\u7528 <code>stale-while-revalidate<\/code> \u914d\u5408\u80cc\u666f\u5237\u65b0\uff0c\u4fdd\u8bc1\u53ef\u7528\u6027\u7684\u540c\u65f6\u51cf\u5c11\u56de\u6e90\u538b\u529b\u3002<\/li>\n<li>\u542f\u7528\u6587\u4ef6\u6307\u7eb9\u5316\uff08content hashing\uff09\u548c\u5408\u7406\u7684\u9759\u6001\u8def\u5f84\u7b56\u7565\uff0c\u907f\u514d\u4f7f\u7528query string\u505a\u7248\u672c\u63a7\u5236\uff08\u9664\u975eCDN\u5bf9query\u53c2\u6570\u652f\u6301\u826f\u597d\uff09\u3002<\/li>\n<li>\u542f\u7528\u538b\u7f29\uff08Gzip\/Brotli\uff09\u4e0e\u5408\u5e76\u8d44\u6e90\uff08CSS\/JS\u5408\u5e76\u3001HTTP\/2\u4e0b\u9002\u5ea6\u62c6\u5206\uff09\uff0c\u914d\u5408CDN\u8fb9\u7f18\u538b\u7f29\u80fd\u529b\u4ee5\u964d\u4f4e\u7f51\u7edc\u4f20\u8f93\u4f53\u79ef\u3002<\/li>\n<\/ul>\n<h3>\u52a8\u6001\u4e0e\u4e2a\u6027\u5316\u5185\u5bb9\u7f13\u5b58\u7b56\u7565<\/h3>\n<ul>\n<li>\u5bf9\u53ef\u7f13\u5b58\u7684\u52a8\u6001\u63a5\u53e3\u4f7f\u7528\u77edTTL\u6216\u7f13\u5b58\u5e26\u6761\u4ef6\uff08\u5982\u6309\u7528\u6237\u89d2\u8272\u3001\u5730\u533a\u5206\u6d41\uff09\u3002\u4f8b\u5982\u5546\u54c1\u8be6\u60c5\u9875\u53ef\u4ee5\u6309SKU+\u8bed\u8a00\u505a\u7f13\u5b58\u952e\uff0cTTL\u8bbe\u7f6e\u4e3a\u6570\u5206\u949f\u5230\u6570\u5c0f\u65f6\u3002<\/li>\n<li>\u4f7f\u7528\u8fb9\u7f18\u8ba1\u7b97\uff08Edge Functions\uff09\u6216Serverless\u5728\u8fb9\u7f18\u505a\u8f7b\u91cf\u5316\u4e2a\u6027\u5316\u62fc\u88c5\uff1a\u5c06\u4e0d\u53ef\u7f13\u5b58\u7684\u7528\u6237\u4e13\u5c5e\u7247\u6bb5\u901a\u8fc7AJAX\u6216Edge Render\u6ce8\u5165\uff0c\u4ece\u800c\u6574\u4f53\u4fdd\u6301\u9875\u9762\u9ad8\u547d\u4e2d\u7387\u3002<\/li>\n<li>\u91c7\u7528\u5206\u5c42\u7f13\u5b58\u4e0e\u7f13\u5b58\u5206\u533a\uff08Sharding\uff09\uff1a\u5c06API\u5206\u4e3a\u516c\u5171\u6570\u636e\u548c\u79c1\u6709\u6570\u636e\u4e24\u7c7b\uff0c\u516c\u5171\u6570\u636e\u653e\u957fTTL\uff0c\u79c1\u6709\u6570\u636e\u91c7\u7528\u8ba4\u8bc1\u540e\u77edTTL\u6216\u4e0d\u7f13\u5b58\u3002<\/li>\n<\/ul>\n<h3>\u7f13\u5b58\u952e\u4e0eHeader\u7b56\u7565<\/h3>\n<ul>\n<li>\u8bbe\u8ba1\u7cbe\u786e\u7684\u7f13\u5b58\u952e\uff08Cache Key\uff09\uff1a\u901a\u5e38\u5305\u62ecURL\u8def\u5f84\u3001Host\u3001\u4f46\u9700\u8c28\u614e\u5bf9\u5f85Query String\u4e0eCookie\u3002\u5bf9\u4e0d\u5f71\u54cd\u5185\u5bb9\u7684query\u53c2\u6570\u5e94\u5ffd\u7565\u3002<\/li>\n<li>\u5408\u7406\u4f7f\u7528 <code>Vary<\/code> \u5934\uff1a\u4ec5\u9488\u5bf9\u786e\u5b9e\u9700\u8981\u7684\u7ef4\u5ea6\uff08\u5982 <code>Accept-Encoding<\/code>\u3001<code>Accept-Language<\/code>\uff09\uff0c\u907f\u514d\u6cdb\u5316\u9020\u6210\u7f13\u5b58\u5206\u6563\u3002<\/li>\n<li>\u4f7f\u7528Surrogate Keys\u6216Cache Tags\uff08\u82e5CDN\u652f\u6301\uff09\u5b9e\u73b0\u6309\u6807\u7b7e\u6279\u91cf\u6e05\u7406\uff0c\u6bd4\u9010URL purge\u66f4\u9ad8\u6548\u3001\u6210\u672c\u4f4e\u3002<\/li>\n<li>\u5bf9\u6d89\u53ca\u9274\u6743\u7684\u8d44\u6e90\uff0c\u4f18\u5148\u8003\u8651\u4f7f\u7528\u7b7e\u540dURL\uff08Signed URL\uff09\u6216\u77edTTL\u7f13\u5b58\uff0c\u4ee5\u517c\u987e\u5b89\u5168\u4e0e\u6027\u80fd\u3002<\/li>\n<\/ul>\n<h3>\u7f13\u5b58\u66f4\u65b0\u4e0e\u5931\u6548\u63a7\u5236<\/h3>\n<ul>\n<li>\u5b9e\u73b0\u7070\u5ea6\/\u589e\u91cf\u66f4\u65b0\uff1a\u5728\u90e8\u7f72\u65b0\u7248\u672c\u65f6\u5148\u53d8\u66f4\u90e8\u5206\u8d44\u6e90\u6307\u7eb9\u5e76\u89c2\u6d4b\u547d\u4e2d\u7387\uff0c\u518d\u5168\u9762\u5207\u6362\u3002<\/li>\n<li>\u4f7f\u7528\u201c\u80cc\u666f\u5237\u65b0\u201d\u4e0estale\u673a\u5236\uff1a\u914d\u7f6e <code>stale-while-revalidate<\/code> \u548c <code>stale-if-error<\/code>\uff0c\u53ef\u5728\u56de\u6e90\u5931\u8d25\u6216\u5237\u65b0\u4e2d\u7ee7\u7eed\u63d0\u4f9b\u65e7\u5185\u5bb9\uff0c\u4fdd\u6301\u53ef\u7528\u6027\u3002<\/li>\n<li>\u6e05\u6670\u5b9a\u4e49Purge\u7b56\u7565\uff1a\u53ea\u5728\u5fc5\u8981\u65f6\u4f7f\u7528\u5f3a\u5236\u6e05\u7406\uff0c\u5e76\u5c3d\u91cf\u7528\u6279\u91cf\u6807\u7b7e\u6e05\u7406\uff0c\u907f\u514d\u9891\u7e41Purging\u5bfc\u81f4\u8fb9\u7f18\u7f13\u5b58\u51b7\u542f\u52a8\u3002<\/li>\n<li>\u90e8\u7f72\u7f13\u5b58\u9884\u70ed\uff08warming\uff09\uff1a\u5728\u5927\u4fc3\u6216\u53d1\u5e03\u524d\u9884\u5148\u8bbf\u95ee\u5173\u952e\u9875\u9762\uff0c\u4f7f\u5173\u952ePOP\u7f13\u5b58\u547d\u4e2d\u7387\u5728\u6d41\u91cf\u9ad8\u5cf0\u671f\u4fdd\u6301\u8f83\u9ad8\u6c34\u5e73\u3002<\/li>\n<\/ul>\n<h2>\u76d1\u63a7\u3001\u5206\u6790\u4e0e\u81ea\u52a8\u5316<\/h2>\n<p>\u6570\u636e\u9a71\u52a8\u662f\u63d0\u5347\u547d\u4e2d\u7387\u7684\u6838\u5fc3\u3002\u901a\u8fc7\u7ec6\u5316\u76d1\u63a7\u53ef\u4ee5\u9488\u5bf9\u6027\u6539\u8fdb\u3002<\/p>\n<h3>\u9700\u8981\u76d1\u63a7\u7684\u7ef4\u5ea6<\/h3>\n<ul>\n<li>\u6309\u57df\u540d\/\u8def\u5f84\/Content-Type \u7684\u547d\u4e2d\u7387\u5206\u5e03\u3002<\/li>\n<li>\u6309POP\uff08\u5730\u533a\uff09\u548c\u65f6\u95f4\u6bb5\u7684\u547d\u4e2d\u7387\u53d8\u5316\uff0c\u8bc6\u522b\u5730\u7406\u70ed\u70b9\u4e0e\u51b7\u533a\u3002<\/li>\n<li>\u56de\u6e90\u5e26\u5bbd\u3001\u56de\u6e90\u8bf7\u6c42\u6570\u4e0e\u54cd\u5e94\u72b6\u6001\u7801\uff08\u7279\u522b\u662f5xx\u4e0e4xx\uff09\u3002<\/li>\n<li>\u8fb9\u7f18\u4e0e\u6e90\u7ad9\u65f6\u5ef6\u3001\u9996\u6b21\u5b57\u8282\uff08TTFB\uff09\u4e0e\u5b8c\u6574\u52a0\u8f7d\u65f6\u95f4\u3002<\/li>\n<\/ul>\n<h3>\u57fa\u4e8e\u6570\u636e\u7684\u81ea\u52a8\u5316\u7b56\u7565<\/h3>\n<ul>\n<li>\u5efa\u7acb\u81ea\u52a8\u5316\u89c4\u5219\uff1a\u5f53\u67d0\u6587\u4ef6\u5728\u67d0POP\u7684\u56de\u6e90\u6b21\u6570\u8d85\u8fc7\u9608\u503c\uff0c\u81ea\u52a8\u5c06\u8be5\u8d44\u6e90\u52a0\u5165\u9884\u70ed\u961f\u5217\u6216\u63d0\u5347TTL\u3002<\/li>\n<li>\u7ed3\u5408\u65e5\u5fd7\u5206\u6790\uff08CDN access log + origin log\uff09\uff0c\u7528\u6279\u5904\u7406\u6216\u6d41\u5f0f\u5206\u6790\u53d1\u73b0\u9ad8\u9891miss\u5e76\u6539\u5584\u7f13\u5b58\u952e\u6216\u5ffd\u7565\u4e0d\u5fc5\u8981\u7684query\u53c2\u6570\u3002<\/li>\n<li>\u5bf9\u5f02\u5e38\u56de\u6e90\u6d41\u91cf\u8bbe\u7f6e\u544a\u8b66\uff0c\u7ed3\u5408WAF\u4e0e\u9650\u6d41\u7b56\u7565\u9632\u6b62\u722c\u866b\u6216\u653b\u51fb\u5f15\u53d1\u7f13\u5b58\u964d\u6548\u4e0e\u6210\u672c\u6fc0\u589e\u3002<\/li>\n<\/ul>\n<h2>\u6210\u672c\u4f18\u5316\u4e0e\u67b6\u6784\u5bf9\u6bd4<\/h2>\n<p>\u901a\u8fc7\u63d0\u5347\u547d\u4e2d\u7387\u53ef\u4ee5\u5728\u591a\u79cd\u7ef4\u5ea6\u964d\u4f4e\u6210\u672c\uff1a\u51cf\u5c11\u6e90\u7ad9\u5e26\u5bbd\u3001\u964d\u4f4e\u6e90\u7ad9\u89c4\u6a21\uff08\u5982\u9009\u62e9\u66f4\u5c0f\u5e26\u5bbd\u7684\u9999\u6e2f\u670d\u52a1\u5668\u6216\u7f8e\u56fd\u670d\u52a1\u5668\uff09\u3001\u51cf\u8f7b\u6570\u636e\u5e93\u4e0e\u5e94\u7528\u540e\u7aef\u538b\u529b\u7b49\u3002<\/p>\n<h3>\u5355CDN vs \u591aCDN<\/h3>\n<ul>\n<li>\u5355CDN\u90e8\u7f72\uff1a\u8fd0\u7ef4\u7b80\u5355\u3001\u7ba1\u7406\u6210\u672c\u4f4e\uff0c\u9002\u5408\u6d41\u91cf\u89c4\u6a21\u4e2d\u7b49\u4e14\u5bf9\u591a\u5730\u57df\u9ad8\u53ef\u7528\u8981\u6c42\u4e0d\u9ad8\u7684\u573a\u666f\u3002<\/li>\n<li>\u591aCDN\u90e8\u7f72\uff1a\u53ef\u4ee5\u5728\u4e0d\u540c\u533a\u57df\uff08\u65e5\u672c\u670d\u52a1\u5668\u3001\u97e9\u56fd\u670d\u52a1\u5668\u3001\u65b0\u52a0\u5761\u670d\u52a1\u5668\u3001\u9999\u6e2f\u53ca\u7f8e\u56fd\u7b49\uff09\u9009\u53d6\u5ef6\u8fdf\u4e0e\u6d41\u91cf\u6210\u672c\u66f4\u4f18\u7684\u4f9b\u5e94\u5546\uff0c\u5b9e\u73b0\u667a\u80fd\u8c03\u5ea6\u548c\u6545\u969c\u5207\u6362\uff0c\u4f46\u9700\u8981\u6d41\u91cf\u8c03\u5ea6\u3001\u8bc1\u4e66\u4e0eCache Key\u7edf\u4e00\u7b49\u989d\u5916\u8fd0\u7ef4\u5de5\u4f5c\u3002<\/li>\n<\/ul>\n<h3>Tiered Caching \u4e0e Edge Compute \u7684\u4f18\u52bf<\/h3>\n<ul>\n<li>Tiered Caching\uff08\u5206\u5c42\u7f13\u5b58\uff09\u80fd\u5c06\u8fb9\u7f18miss\u6d41\u91cf\u5148\u547d\u4e2d\u5230\u533a\u57df\u4e2d\u95f4\u5c42\uff0c\u51cf\u5c11\u5230\u6e90\u7ad9\u7684\u8bf7\u6c42\u6b21\u6570\uff0c\u9002\u5408\u6709\u5927\u91cf\u76f8\u540c\u5185\u5bb9\u4f46\u5206\u5e03\u5728\u591a\u4e2aPOP\u7684\u60c5\u51b5\u3002<\/li>\n<li>Edge Compute\u53ef\u4ee5\u5728\u8fb9\u7f18\u5bf9\u8bf7\u6c42\u8fdb\u884c\u8f7b\u91cf\u5316\u5904\u7406\uff08A\/B\u3001\u538b\u7f29\u3001\u91cd\u5199URL\uff09\uff0c\u51cf\u5c11\u56de\u6e90\u5e76\u63d0\u9ad8\u6574\u4f53\u547d\u4e2d\u7387\u3002<\/li>\n<\/ul>\n<h2>\u9009\u8d2d\u5efa\u8bae\u4e0e\u5b9e\u8df5\u573a\u666f<\/h2>\n<p>\u5728\u9009\u8d2dCDN\u4e0e\u670d\u52a1\u5668\u65f6\uff0c\u9700\u7ed3\u5408\u4e1a\u52a1\u5730\u57df\u5206\u5e03\u3001\u9884\u7b97\u4e0e\u6280\u672f\u6808\u8003\u91cf\u3002<\/p>\n<h3>\u4f01\u4e1a\u7ad9\u70b9\u4e0e\u5168\u7403\u4e1a\u52a1<\/h3>\n<ul>\n<li>\u82e5\u4e1a\u52a1\u5728\u4e9a\u592a\uff08\u9999\u6e2f\u3001\u65e5\u672c\u3001\u97e9\u56fd\u3001\u65b0\u52a0\u5761\uff09\u6709\u5927\u91cf\u7528\u6237\uff0c\u4f18\u5148\u9009\u62e9\u5728\u8fd9\u4e9b\u5730\u533aPOP\u8986\u76d6\u4e0e\u94fe\u8def\u8d28\u91cf\u826f\u597d\u7684CDN\u65b9\u6848\uff0c\u7ed3\u5408\u9999\u6e2f\u670d\u52a1\u5668\u6216\u9999\u6e2fVPS\u4f5c\u4e3a\u6e90\u7ad9\u53ef\u964d\u4f4e\u533a\u57df\u56de\u6e90\u5ef6\u8fdf\u3002<\/li>\n<li>\u7f8e\u56fd\u5e02\u573a\u91cd\u8981\u65f6\uff0c\u9700\u8003\u8651\u7f8e\u56fd\u670d\u52a1\u5668\u6216\u7f8e\u56fdVPS\u7684\u7f51\u7edc\u76f4\u8fde\u80fd\u529b\uff0c\u5e76\u5728CDN\u914d\u7f6e\u4e2d\u786e\u4fdd\u5317\u7f8ePOP\u4f18\u5316\u3002<\/li>\n<\/ul>\n<h3>\u5f00\u53d1\u8005\u4e0e\u7ad9\u957f\u7684\u6280\u672f\u5b9e\u8df5\u6e05\u5355<\/h3>\n<ul>\n<li>\u68b3\u7406\u8d44\u6e90\u6e05\u5355\u5e76\u5206\u7c7b\uff08\u9759\u6001\u3001\u53ef\u7f13\u5b58\u52a8\u6001\u3001\u4e0d\u53ef\u7f13\u5b58\uff09\u3002<\/li>\n<li>\u4e3a\u9759\u6001\u8d44\u6e90\u5b9e\u73b0\u957f\u671fTTL + 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