Nginx前后端分离传递客户端IP

前后端分离，采用nginx作为静态服务器，并通过反向代理的方式实现接口跨域，导致后端获取的请求都是前端IP。

	server {
        listen       80;
        server_name  localhost;
        
        proxy_set_header X-Real-IP $remote_addr;
		proxy_set_header X-Real-Port $remote_port;
		proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        
        location / {
            proxy_pass http://myTomcatServer;
            index  index.html index.htm;
        }

        error_page   500 502 503 504  /50x.html;
        location = /50x.html {
            root   html;
        }
    }

proxy_set_header Host $host; # 可能导致502