websocket未通过代理连接

我在centos7的

/etc/apache/conf

中以这种方式添加了代理

<VirtualHost *:443>
    ServerName mysitecom

    RewriteEngine On

    # When Upgrade:websocket header is present, redirect to ws
    # Using NC flag (case-insensitive) as some browsers will pass Websocket
    RewriteCond %{HTTP:Upgrade} =websocket [NC]
    RewriteRule ^/ws/(.*)    wss://mysitecom:3555/ws/$1 [P,L]

    # All other requests go to http
    ProxyPass "/" "http://mysitecom:3555/"

</VirtualHost>

我得到的错误是：

websocket.js:82 websocket连接到'wss://mysitecom/socket.io/?EIO=4&transport=websocket

注意：3555端口已启用，我已检查它是否正在侦听

我哪里出错了？请纠正我

var sock = io("wss://mysitecom/ws/", {
      transports: ['websocket']
   });