upstream servers {

        ip_hash; #hash，ip轮训

        server localhost:8400;   

  }  

server {

        listen       80;

        server_name  localhost;   #这里可以配置多个ip

        #charset koi8-r;  

        #access_log  logs/access.log  main;  

        location / {

         proxy_set_header   Host             $host;

         proxy_set_header   X-Real-IP        $remote_addr;

         proxy_set_header   X-Forwarded-For  $proxy_add_x_forwarded_for;

         proxy_pass http://servers;

         proxy_redirect off;

        }

        error_page   500 502 503 504  /50x.html;

        location = /50x.html {

            root   html;

        }

}