server {
  listen 80;
  server_name proxy.domain.com;
  gzip on;
  error_log logs/proxy.log;
  location / {
    proxy_pass http://localhost:4000;
    proxy_redirect default;
    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_set_header REMOTE-HOST $remote_addr;
  }
}