nginx.conf

#worker_processes  2;

events {
    worker_connections  1024;
}

http {
  include       mime.types;
  gzip  on;

  server {
    listen 80;
    server_name your-app.com *.your-app.com;
    location / {
      proxy_pass http://127.0.0.1:2000/;
      proxy_http_version 1.1;
      proxy_set_header Upgrade $http_upgrade;
      proxy_set_header Connection "upgrade";
      proxy_set_header Host $host;
    }
  }

}