隐藏上游代理报头
当nginx被用来反向代理上游服务器(比如一个PHP-fpm实例)时，
隐藏在上游响应中发送的某些报头(比如PHP运行的版本)是有益的。
可以使用proxy_hide_header(或Lua模块)来隐藏/删除上游服务器返回到你的nginx反向代理(并最终返回到客户端)的头文件。
使用方式
代理http服务的location块添加include /etc/nginx/conf/conf.d/hide-headers.rule;配置
```nginx configuration upstream ddd-server { server 11.11.11.11:80; server 11.11.11.12:80; } server { listen 8081; location /ddd { include /etc/nginx/conf/conf.d/hide-headers.rule; proxy_pass http://ddd-server; } }
`/etc/nginx/conf/conf.d/hide-headers.rule`:
```nginx configuration
proxy_hide_header X-Application-Context;
proxy_hide_header Access-Control-Allow-Origin;
proxy_hide_header X-Powered-By;
proxy_hide_header X-AspNetMvc-Version;
proxy_hide_header X-Drupal-Cache;
proxy_hide_header X-Powered-By;
proxy_hide_header Server;
proxy_hide_header X-AspNet-Version;
proxy_hide_header X-Drupal-Dynamic-Cache;
proxy_hide_header X-Generator;
proxy_hide_header X-Runtime;
proxy_hide_header X-Rack-Cache;