server
{
listen 80;
server_name xxxx.3322.org;

resolver 8.8.8.8;
set $backend " xxxx.3322.org";

location / {
proxy_pass http://$backend:2222;
proxy_redirect off;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header Host $host;
}
}