gistfile1.txt

    location / {
      if (-f $uri/index.html) {
       add_header Cache-Control "max-age=0, no-store";
       add_header Pragma "no-cache";
       expires 0;
      }

      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_redirect off;

      if (!-f $request_filename) {
        proxy_pass http://unicorn_teambox;
        break;
      }
    }