QHttpAbstractServer does not follow server listen() convention

I don't think QAbstractHttpServer::listen() returning the port or -1 on failure is a good idea. QTcpServer sets precedent and QWebSockerServer, QSctpServer follow, where listen() is a bool:
bool QTcpServer::listen(const QHostAddress &address = QHostAddress::Any, quint16 port = 0);
quint16 QTcpServer::serverPort() const;

I'd expect the convention to be followed? It's going to mess me up if I have to check for -1 return on some listens() and not others. For example:

if (server.listen(8080)) {
// I expect to be listening
}

Will execute as expected for all but the HTTP servers, but will still execute as success when QAbstractHttpServer returns -1 when it actually failed.