Configuración Nginx

http {
   ...
   upstream app_gps {
       server 127.0.0.1:8000;
   }

   server {
        listen 80 default_server;
        server_name gps.qui.guifi.net;
        access_log  /var/log/nginx/gps.qui.guifi.net.access.log  main;

        location / {
                proxy_set_header X-Real-IP $remote_addr;
                proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
                proxy_set_header Host $http_host;
                proxy_set_header X-NginX-Proxy true;
                proxy_pass http://app_gps;
                proxy_redirect off;
        } 
    }
}