When connect to an wss socked, QWebSocket requestUrl().toString() returns always ws. But in this case it must be wss.

Sample:
from http://doc.qt.io/qt-5/qtwebsockets-sslechoserver-sslechoserver-cpp.html
change

qDebug() << "Client connected:" << pSocket->peerName() << pSocket->origin();

to

qDebug() << "Client connected:" << pSocket->peerName() << pSocket->origin();
qDebug()<< pSocket->requestUrl().toString();

The result will be:
"ws://localhost:1234/"
instant of
"wss://localhost:1234/"