nginx将请求代理转发到后台以后, 后台得不到浏览器的ip地址, 加上这些 proxy_set_header ``` location /prod-api/ { proxy_set_header Host $http_host; proxy_set_header X-Real-IP $remote_addr; proxy_set_header REMOTE-HOST $remote_addr; proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; ```