Simple NGINX forwarding

discourse.conf

  upstream discourse {
  #fail_timeout is optional; I throw it in to see errors quickly
    server 127.0.0.1:4578 fail_timeout=5;
  }
 
  # configure the virtual host
  server {
    # replace with your domain name
    server_name discourse.example.com;
 
    location / {
      proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
      proxy_set_header Host $http_host;
      proxy_redirect off;
      # pass to the upstream discourse server mentioned above
      proxy_pass http://discourse;
    }
  }