nginx websocket proxy

nginx.conf

worker_processes  1;

#error_log  logs/error.log;
#error_log  logs/error.log  notice;
#error_log  logs/error.log  info;

#pid        logs/nginx.pid;

events {
  worker_connections  1024;
}

http {
  upstream app {
    server localhost:8080;
  }

  include       mime.types;
  default_type  application/octet-stream;
  sendfile        on;
  keepalive_timeout  65;
  server {
    listen       80;
    server_name  localhost;
    location / {
      proxy_read_timeout     300;
      proxy_connect_timeout  300;
      proxy_set_header       Host               $host;
      proxy_set_header       X-Real-IP          $remote_addr;
      proxy_set_header       X-Forwarded-Host   $host;
      proxy_set_header       X-Forwarded-Server $host;
      proxy_set_header       X-Forwarded-For    $proxy_add_x_forwarded_for;
      proxy_set_header       X-Document-Root    $document_root;
      proxy_set_header       X-Document-URI     $document_uri;
      proxy_set_header       Upgrade            $http_upgrade;
      proxy_set_header       Connection         "Upgrade";

      proxy_pass  http://app;
    }
  }
}