{"id":422,"date":"2026-10-09T01:54:50","date_gmt":"2026-10-08T17:54:50","guid":{"rendered":"https:\/\/www.maskproxy.net\/blog\/proxy-502-503-504-gateway-upstream-retry-checklist\/"},"modified":"2026-10-09T01:54:50","modified_gmt":"2026-10-08T17:54:50","slug":"proxy-502-503-504-gateway-upstream-retry-checklist","status":"publish","type":"post","link":"https:\/\/www.maskproxy.net\/blog\/proxy-502-503-504-gateway-upstream-retry-checklist\/","title":{"rendered":"\u4ee3\u7406\u8fd4\u56de 502\u3001503\u3001504 \u600e\u4e48\u6392\u67e5\uff1a\u7f51\u5173\u3001\u4e0a\u6e38\u8282\u70b9\u3001\u76ee\u6807\u7ad9\u548c\u91cd\u8bd5\u8fb9\u754c"},"content":{"rendered":"<p>\u4ee3\u7406\u8bf7\u6c42\u8fd4\u56de 502\u3001503 \u6216 504 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IP \u548c\u8bf7\u6c42\u6807\u8bc6\uff0c\u518d\u505a\u6700\u5c0f\u590d\u6d4b\u3002\u4efb\u4f55\u4e00\u6b65\u4ecd\u65e0\u6cd5\u89e3\u91ca\u9519\u8bef\u6765\u6e90\u65f6\uff0c\u90fd\u5e94\u6682\u505c\u6279\u91cf\u4efb\u52a1\u3002<\/p>\n<h2>\u5148\u5206\u6e05 502\u3001503 \u548c 504 \u5206\u522b\u5728\u8bf4\u4ec0\u4e48<\/h2>\n<p><strong>502<\/strong> \u901a\u5e38\u8868\u793a\u7f51\u5173\u4ece\u4e0a\u6e38\u6536\u5230\u65e0\u6548\u54cd\u5e94\uff1b<strong>503<\/strong> \u8868\u793a\u670d\u52a1\u6682\u65f6\u4e0d\u53ef\u7528\uff0c\u5e38\u89c1\u4e8e\u7ef4\u62a4\u3001\u8fc7\u8f7d\u6216\u8d44\u6e90\u8017\u5c3d\uff1b<strong>504<\/strong> \u8868\u793a\u7f51\u5173\u7b49\u5f85\u4e0a\u6e38\u54cd\u5e94\u8d85\u65f6\u3002\u5b83\u4eec\u63cf\u8ff0\u7684\u662f\u7f51\u5173\u770b\u5230\u7684\u7ed3\u679c\uff0c\u4e0d\u4e00\u5b9a\u80fd\u76f4\u63a5\u8bc1\u660e\u54ea\u53f0\u670d\u52a1\u5668\u53d1\u751f\u6545\u969c\u3002<\/p>\n<p>\u540c\u4e00\u4e2a\u72b6\u6001\u7801\u4e5f\u53ef\u80fd\u7531\u4e0d\u540c\u7f51\u7edc\u8df3\u70b9\u751f\u6210\u3002\u5148\u67e5\u770b\u54cd\u5e94\u5934\u3001\u9519\u8bef\u9875\u6837\u5f0f\u3001\u670d\u52a1\u5668\u6807\u8bc6\u3001\u8bf7\u6c42\u8ffd\u8e2a\u5b57\u6bb5\u548c\u65f6\u95f4\u7279\u5f81\uff0c\u5224\u65ad\u5b83\u6765\u81ea\u672c\u5730\u4ee3\u7406\u5165\u53e3\u3001\u670d\u52a1\u5546\u7f51\u5173\u3001\u4e0a\u6e38\u51fa\u53e3\u8fd8\u662f\u76ee\u6807\u7ad9\u3002\u82e5\u8bf7\u6c42\u5728\u5efa\u7acb\u8fde\u63a5\u524d\u5c31\u88ab\u62d2\u7edd\uff0c\u5e94\u8f6c\u5165<a href=\"https:\/\/www.maskproxy.net\/blog\/proxy-connection-refused-host-port-protocol-auth-firewall-checklist\/\">\u4e3b\u673a\u3001\u7aef\u53e3\u4e0e\u9632\u706b\u5899\u68c0\u67e5\u987a\u5e8f<\/a>\uff0c\u4e0d\u8981\u7ee7\u7eed\u6309\u7f51\u5173\u9519\u8bef\u5904\u7406\u3002<\/p>\n<h2>\u7b2c\u4e00\u6b65\uff1a\u4fdd\u5b58\u4e00\u4efd\u53ef\u590d\u73b0\u7684\u6700\u5c0f\u8bf7\u6c42<\/h2>\n<p>\u9009\u4e00\u4e2a\u4e0d\u4f1a\u6539\u53d8\u8d26\u53f7\u6216\u4e1a\u52a1\u72b6\u6001\u7684\u8f7b\u91cf\u8bf7\u6c42\uff0c\u56fa\u5b9a\u76ee\u6807\u57df\u540d\u3001\u8def\u5f84\u3001\u65b9\u6cd5\u3001\u8bf7\u6c42\u5934\u3001\u4ee3\u7406\u534f\u8bae\u548c\u8ba4\u8bc1\u65b9\u5f0f\uff0c\u8fde\u7eed\u6d4b\u8bd5\u5c11\u91cf\u6b21\u6570\u3002\u6bcf\u6b21\u8bb0\u5f55\u5f00\u59cb\u65f6\u95f4\u3001DNS \u7ed3\u679c\u3001\u8fde\u63a5\u8017\u65f6\u3001TLS \u8017\u65f6\u3001\u9996\u5305\u65f6\u95f4\u3001\u603b\u8017\u65f6\u3001\u72b6\u6001\u7801\u3001\u54cd\u5e94\u5934\u548c\u8bf7\u6c42\u6807\u8bc6\u3002<\/p>\n<ul>\n<li><strong>\u901a\u8fc7\u6761\u4ef6\uff1a<\/strong>\u9519\u8bef\u53ef\u4ee5\u5728\u76f8\u540c\u6761\u4ef6\u4e0b\u7a33\u5b9a\u590d\u73b0\uff0c\u4e14\u80fd\u591f\u786e\u5b9a\u751f\u6210\u72b6\u6001\u7801\u7684\u7f51\u7edc\u8df3\u70b9\u3002<\/li>\n<li><strong>\u5931\u8d25\u6761\u4ef6\uff1a<\/strong>\u540c\u4e00\u6761\u4ef6\u5728 502\u3001503\u3001504\u3001\u8d85\u65f6\u548c\u6210\u529f\u4e4b\u95f4\u65e0\u89c4\u5f8b\u53d8\u5316\u3002<\/li>\n<li><strong>\u505c\u6b62\u6761\u4ef6\uff1a<\/strong>\u6700\u5c0f\u8bf7\u6c42\u4f1a\u89e6\u53d1\u5199\u5165\u3001\u767b\u5f55\u3001\u652f\u4ed8\u6216\u5176\u4ed6\u4e0d\u53ef\u9006\u4e1a\u52a1\u52a8\u4f5c\u3002<\/li>\n<\/ul>\n<p>\u91cd\u8bd5\u6b21\u6570\u548c\u95f4\u9694\u5e94\u63d0\u524d\u5199\u660e\u3002\u53ef\u4ee5\u6cbf\u7528<a href=\"https:\/\/www.maskproxy.net\/blog\/proxy-retry-strategy-timeout-429-reset-session-checklist\/\">\u8d85\u65f6\u3001\u9519\u8bef\u7801\u4e0e\u91cd\u8bd5\u987a\u5e8f<\/a>\u4e2d\u7684\u8bb0\u5f55\u65b9\u5f0f\uff0c\u907f\u514d\u6d4b\u8bd5\u811a\u672c\u5728\u6545\u969c\u671f\u95f4\u5f62\u6210\u65e0\u4e0a\u9650\u5faa\u73af\u3002<\/p>\n<h2>\u7b2c\u4e8c\u6b65\uff1a\u5224\u65ad\u6545\u969c\u8303\u56f4\u662f\u5355\u76ee\u6807\u3001\u5355\u7ebf\u8def\u8fd8\u662f\u5168\u5165\u53e3<\/h2>\n<p>\u7528\u540c\u4e00\u4ee3\u7406\u7ebf\u8def\u8bbf\u95ee\u4e24\u4e2a\u7ecf\u8fc7\u6279\u51c6\u7684\u4f4e\u98ce\u9669\u76ee\u6807\uff0c\u518d\u7528\u53e6\u4e00\u6761\u5df2\u77e5\u6b63\u5e38\u7ebf\u8def\u8bbf\u95ee\u539f\u76ee\u6807\u3002\u4e00\u6b21\u53ea\u6539\u53d8\u4e00\u4e2a\u53d8\u91cf\uff0c\u4ee5\u533a\u5206\u76ee\u6807\u7ad9\u6545\u969c\u3001\u5355\u4e2a\u4e0a\u6e38\u8282\u70b9\u6545\u969c\u548c\u6574\u4e2a\u4ee3\u7406\u5165\u53e3\u6545\u969c\u3002<\/p>\n<figure class=\"wp-block-table\">\n<table>\n<thead>\n<tr>\n<th>\u590d\u6d4b\u7ed3\u679c<\/th>\n<th>\u66f4\u53ef\u80fd\u7684\u4f4d\u7f6e<\/th>\n<th>\u4e0b\u4e00\u6b65<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>\u540c\u4e00\u7ebf\u8def\u4ec5\u4e00\u4e2a\u76ee\u6807\u62a5\u9519<\/td>\n<td>\u76ee\u6807\u7ad9\u6216\u8be5\u76ee\u6807\u7684\u4e0a\u6e38\u8def\u5f84<\/td>\n<td>\u6bd4\u8f83\u76ee\u6807\u7ad9\u72b6\u6001\u3001DNS\u3001TLS \u548c\u54cd\u5e94\u65f6\u95f4<\/td>\n<\/tr>\n<tr>\n<td>\u540c\u4e00\u7ebf\u8def\u591a\u4e2a\u76ee\u6807\u62a5\u9519<\/td>\n<td>\u4ee3\u7406\u5165\u53e3\u3001\u4e0a\u6e38\u8282\u70b9\u6216\u5171\u4eab\u7f51\u5173<\/td>\n<td>\u68c0\u67e5\u8282\u70b9\u72b6\u6001\u4e0e\u670d\u52a1\u8303\u56f4<\/td>\n<\/tr>\n<tr>\n<td>\u6362\u7ebf\u8def\u540e\u539f\u76ee\u6807\u6062\u590d<\/td>\n<td>\u539f\u7ebf\u8def\u6216\u539f\u8282\u70b9\u8def\u5f84<\/td>\n<td>\u9694\u79bb\u539f\u7ebf\u8def\u5e76\u505a\u51b7\u5374\u590d\u6d4b<\/td>\n<\/tr>\n<tr>\n<td>\u6240\u6709\u7ebf\u8def\u8bbf\u95ee\u539f\u76ee\u6807\u90fd\u62a5\u9519<\/td>\n<td>\u76ee\u6807\u7ad9\u3001\u516c\u5171\u4e0a\u6e38\u6216\u672c\u5730\u8bf7\u6c42\u6761\u4ef6<\/td>\n<td>\u505c\u6b62\u6269\u91cf\u5e76\u4fdd\u7559\u8bf7\u6c42\u8bc1\u636e<\/td>\n<\/tr>\n<tr>\n<td>\u7ed3\u679c\u6301\u7eed\u6765\u56de\u53d8\u5316<\/td>\n<td>\u5bb9\u91cf\u3001\u8d1f\u8f7d\u5747\u8861\u6216\u95f4\u6b47\u6027\u4e0a\u6e38\u6545\u969c<\/td>\n<td>\u964d\u4f4e\u9891\u7387\u5e76\u6269\u5927\u89c2\u5bdf\u7a97\u53e3<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/figure>\n<h2>\u7b2c\u4e09\u6b65\uff1a\u68c0\u67e5\u7f51\u5173\u5230\u4e0a\u6e38\u8282\u70b9\u7684\u8fde\u63a5\u6761\u4ef6<\/h2>\n<p>\u786e\u8ba4\u4e0a\u6e38\u4e3b\u673a\u3001\u7aef\u53e3\u3001\u534f\u8bae\u5165\u53e3\u548c\u8ba4\u8bc1\u8303\u56f4\u4ecd\u7136\u6709\u6548\u3002502 \u53ef\u80fd\u6765\u81ea\u9519\u8bef\u534f\u8bae\u6216\u4e0a\u6e38\u8fd4\u56de\u5185\u5bb9\u65e0\u6cd5\u89e3\u6790\uff0c504 \u53ef\u80fd\u6765\u81ea\u4e0a\u6e38\u8fde\u63a5\u6216\u54cd\u5e94\u9636\u6bb5\u8d85\u65f6\uff0c503 \u5219\u53ef\u80fd\u8868\u793a\u8282\u70b9\u6682\u65f6\u4e0d\u63a5\u6536\u65b0\u8bf7\u6c42\u3002\u68c0\u67e5\u65f6\u8981\u533a\u5206\u8fde\u63a5\u8d85\u65f6\u3001TLS \u63e1\u624b\u3001\u9996\u5305\u7b49\u5f85\u548c\u54cd\u5e94\u4f20\u8f93\u3002<\/p>\n<p>\u5982\u679c\u9519\u8bef\u96c6\u4e2d\u5728 TLS \u9636\u6bb5\uff0c\u4f7f\u7528<a href=\"https:\/\/www.maskproxy.net\/blog\/proxy-tls-handshake-failed-sni-certificate-protocol-chain-checklist\/\">SNI\u3001\u8bc1\u4e66\u548c\u534f\u8bae\u94fe\u8def\u68c0\u67e5\u8868<\/a>\u9010\u9879\u6838\u5bf9\uff1b\u5982\u679c\u7f51\u5173\u5df2\u7ecf\u6536\u5230\u54cd\u5e94\u4f46\u9875\u9762\u4ecd\u5f88\u6162\uff0c\u5219\u5bf9\u7167<a href=\"https:\/\/www.maskproxy.net\/blog\/proxy-connected-but-page-loads-slow-latency-ttfb-concurrency-checklist\/\">\u5ef6\u8fdf\u3001\u9996\u5305\u548c\u5e76\u53d1\u68c0\u67e5\u65b9\u6cd5<\/a>\u62c6\u5f00\u6d4b\u91cf\uff0c\u4e0d\u8981\u53ea\u770b\u603b\u8017\u65f6\u3002<\/p>\n<h2>\u7b2c\u56db\u6b65\uff1a\u6838\u5bf9\u5bb9\u91cf\u3001\u5e76\u53d1\u548c\u7ef4\u62a4\u7a97\u53e3<\/h2>\n<p>503 \u5e38\u89c1\u4e8e\u670d\u52a1\u7ef4\u62a4\u3001\u8fde\u63a5\u6c60\u8017\u5c3d\u3001\u8282\u70b9\u8fc7\u8f7d\u6216\u5bb9\u91cf\u4fdd\u62a4\uff0c\u4f46\u4e0d\u80fd\u53ea\u51ed\u72b6\u6001\u7801\u65ad\u5b9a\u539f\u56e0\u3002\u628a\u5e76\u53d1\u964d\u5230\u4e00\u4e2a\u8bf7\u6c42\uff0c\u5173\u95ed\u81ea\u52a8\u91cd\u8bd5\uff0c\u518d\u6bd4\u8f83\u4f4e\u5e76\u53d1\u548c\u539f\u5e76\u53d1\u4e0b\u7684\u6210\u529f\u7387\u3001\u9996\u5305\u65f6\u95f4\u4e0e\u9519\u8bef\u5206\u5e03\u3002\u5982\u679c\u4f4e\u5e76\u53d1\u7a33\u5b9a\u800c\u5e76\u53d1\u63d0\u9ad8\u540e 503 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