NGINX通過允許一個在客戶端和後端伺服器之間建立的隧道來支援WebSocket。為了NGINX傳送來至於客戶端Upgrade請求到後端伺服器，Upgrade和Connection頭部必須被設定明確。
示例，這裡我們使用nginx來做代理。

upstream wsbackend {
        server 127.0.0.1:3000;
    }

    server {
        listen       8090;
        server_name  localhost;

        #charset koi8-r;

        #access_log  logs/host.access.log  main;
 


        # location / {
        #    root   html;
        #    index  index.html index.htm;
        # }

        location / {
            proxy_pass http://wsbackend;
            proxy_http_version 1.1;
            proxy_set_header Upgrade $http_upgrade;
            proxy_set_header Connection "upgrade"
 
;
        }
    }