nginx load balancer internal proxy definition

gistfile1.nginxconf

location ^~ /hs_existing_service_proxy {
      internal;
      resolver 8.8.8.8;
      proxy_set_header X-Real-IP $remote_addr;
      proxy_set_header Host $http_host;
      proxy_buffering off;
      proxy_max_temp_file_size 0;
      set $download_url $upstream_http_x_downstream_url;
      proxy_pass $download_url;
    }