gistfile1.txt

upstream thin {
  server 127.0.0.1:3000;
}

server {
  server_name  balancer.todolegal.app;
  
  listen 80;
  listen [::]:80;

  access_log /var/log/nginx/reverse-access.log;
  error_log /var/log/nginx/reverse-error.log;

  location / {
    proxy_pass        http://thin;
    proxy_set_header  Host $host;
    proxy_set_header  X-Forwarded-For $proxy_add_x_forwarded_for;
    proxy_set_header  X-Forwarded-Proto $scheme;
    proxy_set_header  X-Forwarded-Ssl on; # Optional
    proxy_set_header  X-Forwarded-Port $server_port;
    proxy_set_header  X-Forwarded-Host $host;
  }
}