QWebSocketServer checks HTTP headers without ignoring case.

QWebSocketServer will not accept incoming connection if HTTP headers are in lower case.
This is similar to problem that was already reported in QTBUG-37975 that concerned source file qwebsocket_p.cpp.

Similar problem is also in file qwebsockethandshakerequest.cpp.

QWebSocketHandshakeRequest::readHandshake method validates incoming HTTP connection and like in bug 37975 it first collects headers in QMap<QString,QString> and then uses string literal keys to check expected values - case-sensitive compare. On should ignore case in HTTP header keys.

A possible fix is to change line around line 229 in qwebsockethandshakerequest.cpp from

m_headers.insertMulti(headerField.at(0), headerField.at(1));

to

m_headers.insertMulti(headerField.at(0).toLower(), headerField.at(1));

and changing all string literals that act as keys to this m_headers (QMap) to be lower case.