可用于对系统进行标记，便于人们直观的区分测试环境\正式环境等
server { listen 443 ssl; server_name www.baidu.com; #ssl on; ssl_certificate cert/cert.pem; ssl_certificate_key cert/cert.key; ssl_session_timeout 5m; ssl_protocols TLSv1 TLSv1.1 TLSv1.2; ssl_ciphers ALL:!ADH:!EXPORT56:RC4+RSA:+HIGH:+MEDIUM:+LOW:+SSLv2:+EXP; ssl_prefer_server_ciphers on; set $injected ‘<div style="position: absolute; z-index:9999; color:red; font-size:10px">测试环境</div>‘; sub_filter ‘<body>‘ ‘<body>${injected}‘;//重点在这 匹配<body>标签替换为<body><div>测试环境<div>这样 index index.html index.htm index.jsp; root /data/sudeng-web/; #error_page 404 /404.html; #error_page 502 /502.html; location ~ .*\.(gif|jpg|jpeg|png|bmp|swf|flv|mp4|ico)$ { expires 30d; access_log off; } location ~ .*\.(js|css)?$ { expires 7d; access_log off; } location ~ /\.ht { deny all; } }
在系统左上角页面都可以标签，项目侵入性也较小
nginx拦截HTML页面并修改页面内容(sub_filter简单用法)
原文：https://www.cnblogs.com/yu29/p/12877749.html