通过nginx代理ip地址之后无法获取用户真实的访问地址

1.无法获取用户请求ip的nginx配置

 server {
    listen 80;
    server_name xxx.cn;
        charset utf-8;
    location / {
          proxy_pass   http://localhost:8888;
    }

2.修改

 server {
    listen 80;
    server_name xxx.cn;
        charset utf-8;
    location / {
		  proxy_set_header X-Real-IP $remote_addr;
	      proxy_set_header X-Real-Port $remote_port;
	      proxy_set_header X-Forwarded-For $remote_addr;
          proxy_pass   http://localhost:8888;
    }