[{"data":1,"prerenderedAt":231},["ShallowReactive",2],{"article-nginx-upstream-dns-resolve":3},{"title":4,"article":5,"hot_article":17,"month_arch":80,"cover":228},"nginx upstream DNS解析问题 - 独孤影的博客",{"id":6,"title":7,"uri":8,"author":9,"tags":10,"created_at":14,"view_count":15,"content":16},83,"nginx upstream DNS解析问题","nginx-upstream-dns-resolve","duguying",[11,12,13],"nginx","upstream","dns","2022-11-14 11:20:44",365,"\u003Cp>最近发现我香港服务器上放置的几个 web 站点经常会偶尔出现无法访问的情况，这个香港服务器上放置的是 trojan 加 nginx，流量从trojan进入，部分转发出去，另外部分是web站点的流量，转发到nginx，从而实现流量代理和web访问。\u003C\u002Fp>\n\n\u003Cp>这个香港节点出现web访问异常，之前也遇到过几次，都是重启nginx就正常了。这次决定仔细看下是什么情况，登陆节点，首先查看trojan日志，发现在正常转发，再看下nginx的日志，如下\u003C\u002Fp>\n\n\u003Cpre style=\"color:#e6edf3;background-color:#0d1117;white-space:pre-wrap;word-break:break-word;\">\u003Ccode>\u003Cspan style=\"display:flex;\">\u003Cspan>2022\u002F11\u002F14 01:27:11 [error] 22#22: *473474 upstream timed out (110: Connection timed out) while connecting to upstream, client: 61.177.173.46, server: 0.0.0.0:22, upstream: "36.36.106.166:23000", bytes from\u002Fto client:0\u002F0, bytes from\u002Fto upstream:0\u002F0\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan style=\"display:flex;\">\u003Cspan>2022\u002F11\u002F14 01:27:27 [error] 22#22: *473486 upstream timed out (110: Connection timed out) while connecting to upstream, client: 203.205.141.115, server: 0.0.0.0:22, upstream: "36.36.106.166:23000", bytes from\u002Fto client:0\u002F0, bytes from\u002Fto upstream:0\u002F0\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan style=\"display:flex;\">\u003Cspan>2022\u002F11\u002F14 01:28:36 [error] 22#22: *473490 upstream timed out (110: Connection timed out) while connecting to upstream, client: 203.205.141.115, server: 0.0.0.0:22, upstream: "36.36.106.166:23000", bytes from\u002Fto client:0\u002F0, bytes from\u002Fto upstream:0\u002F0\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan style=\"display:flex;\">\u003Cspan>2022\u002F11\u002F14 01:29:19 [error] 22#22: *473492 upstream timed out (110: Connection timed out) while connecting to upstream, client: 61.177.173.52, server: 0.0.0.0:22, upstream: "36.36.106.166:23000", bytes from\u002Fto client:0\u002F0, bytes from\u002Fto upstream:0\u002F0\n\u003C\u002Fspan>\u003C\u002Fspan>\u003C\u002Fcode>\u003C\u002Fpre>\n\n\u003Cp>发现nginx日志显示有连接超时，于是我决定判断一下是否真的连接不上，telnet\u003C\u002Fp>\n\n\u003Cpre style=\"color:#e6edf3;background-color:#0d1117;white-space:pre-wrap;word-break:break-word;\">\u003Ccode>\u003Cspan style=\"display:flex;\">\u003Cspan>➜  trojan git:\u003Cspan style=\"color:#ff7b72;font-weight:bold\">(\u003C\u002Fspan>master\u003Cspan style=\"color:#ff7b72;font-weight:bold\">)\u003C\u002Fspan> telnet 36.36.106.166 \u003Cspan style=\"color:#a5d6ff\">23000\u003C\u002Fspan>\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan style=\"display:flex;\">\u003Cspan>Trying 36.36.106.166...\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan style=\"display:flex;\">\u003Cspan>^C\n\u003C\u002Fspan>\u003C\u002Fspan>\u003C\u002Fcode>\u003C\u002Fpre>\n\n\u003Cp>果然连接不上，我web站点配置如下\u003C\u002Fp>\n\n\u003Cpre style=\"color:#e6edf3;background-color:#0d1117;white-space:pre-wrap;word-break:break-word;\">\u003Ccode>\u003Cspan style=\"display:flex;\">\u003Cspan>\u003Cspan style=\"color:#ff7b72\">server\u003C\u002Fspan> {\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan style=\"display:flex;\">\u003Cspan>    \u003Cspan style=\"color:#ff7b72\">listen\u003C\u002Fspan> \u003Cspan style=\"color:#a5d6ff\">10110\u003C\u002Fspan> \u003Cspan style=\"color:#a5d6ff\">ssl\u003C\u002Fspan> \u003Cspan style=\"color:#a5d6ff\">http2\u003C\u002Fspan>;\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan style=\"display:flex;\">\u003Cspan>    \u003Cspan style=\"color:#ff7b72\">server_name\u003C\u002Fspan> \u003Cspan style=\"color:#a5d6ff\">xxx.duguying.net\u003C\u002Fspan>;\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan style=\"display:flex;\">\u003Cspan>\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan style=\"display:flex;\">\u003Cspan>    \u003Cspan style=\"color:#ff7b72\">root\u003C\u002Fspan> \u003Cspan style=\"color:#a5d6ff\">\u002Fusr\u002Fshare\u002Fnginx\u002Fhtml\u003C\u002Fspan>;\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan style=\"display:flex;\">\u003Cspan>    \u003Cspan style=\"color:#ff7b72\">index\u003C\u002Fspan> \u003Cspan style=\"color:#a5d6ff\">index.php\u003C\u002Fspan> \u003Cspan style=\"color:#a5d6ff\">index.html\u003C\u002Fspan>;\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan style=\"display:flex;\">\u003Cspan>    \u003Cspan style=\"color:#ff7b72\">ssl_certificate\u003C\u002Fspan> \u003Cspan style=\"color:#a5d6ff\">\u002Fdata\u002Fcerts\u002F_.duguying.net.crt\u003C\u002Fspan>; \n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan style=\"display:flex;\">\u003Cspan>    \u003Cspan style=\"color:#ff7b72\">ssl_certificate_key\u003C\u002Fspan> \u003Cspan style=\"color:#a5d6ff\">\u002Fdata\u002Fcerts\u002F_.duguying.net.key\u003C\u002Fspan>;\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan style=\"display:flex;\">\u003Cspan>    \u003Cspan style=\"color:#ff7b72\">ssl_stapling\u003C\u002Fspan> \u003Cspan style=\"color:#79c0ff;font-weight:bold\">on\u003C\u002Fspan>;\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan style=\"display:flex;\">\u003Cspan>    \u003Cspan style=\"color:#ff7b72\">ssl_stapling_verify\u003C\u002Fspan> \u003Cspan style=\"color:#79c0ff;font-weight:bold\">on\u003C\u002Fspan>;\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan style=\"display:flex;\">\u003Cspan>    \u003Cspan style=\"color:#ff7b72\">add_header\u003C\u002Fspan> \u003Cspan style=\"color:#a5d6ff\">Strict-Transport-Security\u003C\u002Fspan> \u003Cspan style=\"color:#a5d6ff\">"max-age=31536000"\u003C\u002Fspan>;\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan style=\"display:flex;\">\u003Cspan>\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan style=\"display:flex;\">\u003Cspan>    \u003Cspan style=\"color:#ff7b72\">location\u003C\u002Fspan> \u003Cspan style=\"color:#a5d6ff\">\u002F\u003C\u002Fspan> {\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan style=\"display:flex;\">\u003Cspan>        \u003Cspan style=\"color:#ff7b72\">include\u003C\u002Fspan> \u003Cspan style=\"color:#a5d6ff\">git.deny\u003C\u002Fspan>;\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan style=\"display:flex;\">\u003Cspan>        \u003Cspan style=\"color:#ff7b72\">proxy_set_header\u003C\u002Fspan> \u003Cspan style=\"color:#a5d6ff\">X-Forwarded-For\u003C\u002Fspan> \u003Cspan style=\"color:#79c0ff\">$remote_addr\u003C\u002Fspan>;\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan style=\"display:flex;\">\u003Cspan>        \u003Cspan style=\"color:#ff7b72\">proxy_set_header\u003C\u002Fspan> \u003Cspan style=\"color:#a5d6ff\">Host\u003C\u002Fspan>            \u003Cspan style=\"color:#79c0ff\">$http_host\u003C\u002Fspan>;\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan style=\"display:flex;\">\u003Cspan>        \u003Cspan style=\"color:#ff7b72\">proxy_set_header\u003C\u002Fspan> \u003Cspan style=\"color:#a5d6ff\">Upgrade\u003C\u002Fspan> \u003Cspan style=\"color:#79c0ff\">$http_upgrade\u003C\u002Fspan>;\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan style=\"display:flex;\">\u003Cspan>        \u003Cspan style=\"color:#ff7b72\">proxy_set_header\u003C\u002Fspan> \u003Cspan style=\"color:#a5d6ff\">Connection\u003C\u002Fspan> \u003Cspan style=\"color:#a5d6ff\">"upgrade"\u003C\u002Fspan>;\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan style=\"display:flex;\">\u003Cspan>        \u003Cspan style=\"color:#ff7b72\">proxy_pass\u003C\u002Fspan> \u003Cspan style=\"color:#a5d6ff\">http:\u002F\u002Fjxx.duguying.net:****\u003C\u002Fspan>;\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan style=\"display:flex;\">\u003Cspan>        \u003Cspan style=\"color:#ff7b72\">proxy_buffering\u003C\u002Fspan>    \u003Cspan style=\"color:#79c0ff;font-weight:bold\">off\u003C\u002Fspan>;\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan style=\"display:flex;\">\u003Cspan>        \u003Cspan style=\"color:#ff7b72\">proxy_buffer_size\u003C\u002Fspan>  \u003Cspan style=\"color:#a5d6ff\">128k\u003C\u002Fspan>;\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan style=\"display:flex;\">\u003Cspan>        \u003Cspan style=\"color:#ff7b72\">proxy_buffers\u003C\u002Fspan> \u003Cspan style=\"color:#a5d6ff\">100\u003C\u002Fspan>  \u003Cspan style=\"color:#a5d6ff\">128k\u003C\u002Fspan>;\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan style=\"display:flex;\">\u003Cspan>    }\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan style=\"display:flex;\">\u003Cspan>}\n\u003C\u002Fspan>\u003C\u002Fspan>\u003C\u002Fcode>\u003C\u002Fpre>\n\n\u003Cp>web站点的流量经香港节点转发到 \u003Ccode class=\"inline-code\">jxx.duguying.net\u003C\u002Fcode> ，dig一下\u003C\u002Fp>\n\n\u003Cpre style=\"color:#e6edf3;background-color:#0d1117;white-space:pre-wrap;word-break:break-word;\">\u003Ccode>\u003Cspan style=\"display:flex;\">\u003Cspan>➜  ~ dig jxx.duguying.net\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan style=\"display:flex;\">\u003Cspan>\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan style=\"display:flex;\">\u003Cspan>; <<>> DiG 9.11.5-P4-5.1+deb10u7-Debian <<>> jxx.duguying.net\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan style=\"display:flex;\">\u003Cspan>;; global options: +cmd\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan style=\"display:flex;\">\u003Cspan>;; Got answer:\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan style=\"display:flex;\">\u003Cspan>;; ->>HEADER\u003Cspan style=\"color:#a5d6ff\"><<- opco\u003C\u002Fspan>de: QUERY, status: NOERROR, id: \u003Cspan style=\"color:#a5d6ff\">25787\u003C\u002Fspan>\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan style=\"display:flex;\">\u003Cspan>;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: \u003Cspan style=\"color:#a5d6ff\">0\u003C\u002Fspan>\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan style=\"display:flex;\">\u003Cspan>\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan style=\"display:flex;\">\u003Cspan>;; QUESTION SECTION:\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan style=\"display:flex;\">\u003Cspan>;jxx.duguying.net.             IN      A\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan style=\"display:flex;\">\u003Cspan>\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan style=\"display:flex;\">\u003Cspan>;; ANSWER SECTION:\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan style=\"display:flex;\">\u003Cspan>jxx.duguying.net.      \u003Cspan style=\"color:#a5d6ff\">60\u003C\u002Fspan>      IN      A       222.248.21.219\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan style=\"display:flex;\">\u003Cspan>\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan style=\"display:flex;\">\u003Cspan>;; Query time: \u003Cspan style=\"color:#a5d6ff\">22\u003C\u002Fspan> msec\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan style=\"display:flex;\">\u003Cspan>;; SERVER: 192.168.1.1#53\u003Cspan style=\"color:#ff7b72;font-weight:bold\">(\u003C\u002Fspan>192.168.1.1\u003Cspan style=\"color:#ff7b72;font-weight:bold\">)\u003C\u002Fspan>\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan style=\"display:flex;\">\u003Cspan>;; WHEN: 一 11月 \u003Cspan style=\"color:#a5d6ff\">14\u003C\u002Fspan> 11:17:24 CST \u003Cspan style=\"color:#a5d6ff\">2022\u003C\u002Fspan>\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan style=\"display:flex;\">\u003Cspan>;; MSG SIZE  rcvd: \u003Cspan style=\"color:#a5d6ff\">51\u003C\u002Fspan>\n\u003C\u002Fspan>\u003C\u002Fspan>\u003C\u002Fcode>\u003C\u002Fpre>\n\n\u003Cp>发现nginx转发的节点居然不是目前upstream域名解析的节点，这说明我upstream域名dns更新了，但是nginx上upstream域名解析没更新。网上查询之后才知道，域名作为upstream，它的解析节点并不会时事更新。解决方案\u003C\u002Fp>\n\n\u003Cp>方案一：每次dns有变化，重启Nginx （最开始出现故障重启nginx恢复就是这种解决方案）\u003Cbr \u002F>\n方案二：使用Nginx Resolver\u003Cbr \u002F>\n方案三：使用 Nginx-upstream-dynamic-server （nginx模块）\u003Cbr \u002F>\n方案四：使用 ngx_upstream_jdomain （nginx模块）\u003C\u002Fp>\n\n\u003Cp>这里介绍一下方案二，添加resolver相关配置，只需要将nginx配置改为如下\u003C\u002Fp>\n\n\u003Cpre style=\"color:#e6edf3;background-color:#0d1117;white-space:pre-wrap;word-break:break-word;\">\u003Ccode>\u003Cspan style=\"display:flex;\">\u003Cspan>\u003Cspan style=\"color:#ff7b72\">server\u003C\u002Fspan> {\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan style=\"display:flex;\">\u003Cspan>    \u003Cspan style=\"color:#ff7b72\">listen\u003C\u002Fspan> \u003Cspan style=\"color:#a5d6ff\">10110\u003C\u002Fspan> \u003Cspan style=\"color:#a5d6ff\">ssl\u003C\u002Fspan> \u003Cspan style=\"color:#a5d6ff\">http2\u003C\u002Fspan>;\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan style=\"display:flex;\">\u003Cspan>    \u003Cspan style=\"color:#ff7b72\">server_name\u003C\u002Fspan> \u003Cspan style=\"color:#a5d6ff\">xxx.duguying.net\u003C\u002Fspan>;\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan style=\"display:flex;\">\u003Cspan>\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan style=\"display:flex;\">\u003Cspan>    \u003Cspan style=\"color:#ff7b72\">resolver\u003C\u002Fspan> \u003Cspan style=\"color:#a5d6ff\">127\u003C\u002Fspan>\u003Cspan style=\"color:#a5d6ff\">.0.0.1\u003C\u002Fspan> \u003Cspan style=\"color:#a5d6ff\">valid=60s\u003C\u002Fspan>;    \u003Cspan style=\"color:#ff7b72\">\u002F\u002F\u003C\u002Fspan> \u003Cspan style=\"color:#a5d6ff\">这里设置dns服务器\u003C\u002Fspan>\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan style=\"display:flex;\">\u003Cspan>    \u003Cspan style=\"color:#a5d6ff\">resolver_timeout\u003C\u002Fspan> \u003Cspan style=\"color:#a5d6ff\">3s\u003C\u002Fspan>;             \u003Cspan style=\"color:#ff7b72\">\u002F\u002F\u003C\u002Fspan> \u003Cspan style=\"color:#a5d6ff\">这里设置dns解析超时时间\u003C\u002Fspan>\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan style=\"display:flex;\">\u003Cspan>\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan style=\"display:flex;\">\u003Cspan>    \u003Cspan style=\"color:#a5d6ff\">root\u003C\u002Fspan> \u003Cspan style=\"color:#a5d6ff\">\u002Fusr\u002Fshare\u002Fnginx\u002Fhtml\u003C\u002Fspan>;\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan style=\"display:flex;\">\u003Cspan>    \u003Cspan style=\"color:#ff7b72\">index\u003C\u002Fspan> \u003Cspan style=\"color:#a5d6ff\">index.php\u003C\u002Fspan> \u003Cspan style=\"color:#a5d6ff\">index.html\u003C\u002Fspan>;\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan style=\"display:flex;\">\u003Cspan>    \u003Cspan style=\"color:#ff7b72\">ssl_certificate\u003C\u002Fspan> \u003Cspan style=\"color:#a5d6ff\">\u002Fdata\u002Fcerts\u002F_.duguying.net.crt\u003C\u002Fspan>; \n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan style=\"display:flex;\">\u003Cspan>    \u003Cspan style=\"color:#ff7b72\">ssl_certificate_key\u003C\u002Fspan> \u003Cspan style=\"color:#a5d6ff\">\u002Fdata\u002Fcerts\u002F_.duguying.net.key\u003C\u002Fspan>;\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan style=\"display:flex;\">\u003Cspan>    \u003Cspan style=\"color:#ff7b72\">ssl_stapling\u003C\u002Fspan> \u003Cspan style=\"color:#79c0ff;font-weight:bold\">on\u003C\u002Fspan>;\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan style=\"display:flex;\">\u003Cspan>    \u003Cspan style=\"color:#ff7b72\">ssl_stapling_verify\u003C\u002Fspan> \u003Cspan style=\"color:#79c0ff;font-weight:bold\">on\u003C\u002Fspan>;\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan style=\"display:flex;\">\u003Cspan>    \u003Cspan style=\"color:#ff7b72\">add_header\u003C\u002Fspan> \u003Cspan style=\"color:#a5d6ff\">Strict-Transport-Security\u003C\u002Fspan> \u003Cspan style=\"color:#a5d6ff\">"max-age=31536000"\u003C\u002Fspan>;\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan style=\"display:flex;\">\u003Cspan>\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan style=\"display:flex;\">\u003Cspan>    \u003Cspan style=\"color:#ff7b72\">location\u003C\u002Fspan> \u003Cspan style=\"color:#a5d6ff\">\u002F\u003C\u002Fspan> {\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan style=\"display:flex;\">\u003Cspan>        \u003Cspan style=\"color:#ff7b72\">include\u003C\u002Fspan> \u003Cspan style=\"color:#a5d6ff\">git.deny\u003C\u002Fspan>;\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan style=\"display:flex;\">\u003Cspan>        \u003Cspan style=\"color:#ff7b72\">proxy_set_header\u003C\u002Fspan> \u003Cspan style=\"color:#a5d6ff\">X-Forwarded-For\u003C\u002Fspan> \u003Cspan style=\"color:#79c0ff\">$remote_addr\u003C\u002Fspan>;\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan style=\"display:flex;\">\u003Cspan>        \u003Cspan style=\"color:#ff7b72\">proxy_set_header\u003C\u002Fspan> \u003Cspan style=\"color:#a5d6ff\">Host\u003C\u002Fspan>            \u003Cspan style=\"color:#79c0ff\">$http_host\u003C\u002Fspan>;\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan style=\"display:flex;\">\u003Cspan>        \u003Cspan style=\"color:#ff7b72\">proxy_set_header\u003C\u002Fspan> \u003Cspan style=\"color:#a5d6ff\">Upgrade\u003C\u002Fspan> \u003Cspan style=\"color:#79c0ff\">$http_upgrade\u003C\u002Fspan>;\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan style=\"display:flex;\">\u003Cspan>        \u003Cspan style=\"color:#ff7b72\">proxy_set_header\u003C\u002Fspan> \u003Cspan 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