Websocket disconnect instantly from QHttpServer

A customer reported that when they try to connect to a httpserver with a websocket, they can get the connection on server side OK but the server pretty much instantly closes the socket.

Steps to reproduce the issue:

• Run server
• Run client

=> Observe the client output

When building server with Qt 6.8.3 and adding:

    s.addWebSocketUpgradeVerifier(&s, [](const QHttpServerRequest &request) {
        return QHttpServerWebSocketUpgradeResponse::accept();
    }); 

the sample will work. The connection will no longer be closed and and the message from the server can now be received.