gistfile1.txt

        upstream backend {
            server unix:/tmp/unicorn.sock;
        }        
        
        location @app {
          proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
          proxy_set_header Host $http_host;
          proxy_set_header X-Forwarded-Proto $scheme;

          proxy_redirect off;

          proxy_pass http://backend;
        }