void QNetworkReplyImplPrivate::_q_startOperation()
{
    // ensure this function is only being called once
    if (state == Working) {
        qDebug("QNetworkReplyImpl::_q_startOperation was called more than once");
        return;
    }
    state = Working;

    // note: if that method is called directly, it cannot happen that the backend is 0,
    // because we just checked via a qobject_cast that we got a http backend (see
    // QNetworkReplyImplPrivate::setup())
    if (!backend) {
        error(QNetworkReplyImpl::ProtocolUnknownError,
              QCoreApplication::translate("QNetworkReply", "Protocol \"%1\" is unknown").arg(url.scheme())); // not really true!;
        finished();
        return;
    }

#ifndef QT_NO_BEARERMANAGEMENT
    if (!backend->start()) {
        // backend failed to start because the session state is not Connected.
        // QNetworkAccessManager will call reply->backend->start() again for us when the session
        // state changes.
        state = WaitingForSession;

        QNetworkSession *session = manager->d_func()->networkSession;

        if (session) {
            Q_Q(QNetworkReplyImpl);

            QObject::connect(session, SIGNAL(error(QNetworkSession::SessionError)),
                             q, SLOT(_q_networkSessionFailed()));

            if (!session->isOpen())
                session->open();
        } else {
            qWarning("Backend is waiting for QNetworkSession to connect, but there is none!");
        }

        return;
    }
#endif

    if (state != Finished) {
        if (operation == QNetworkAccessManager::GetOperation)
            pendingNotifications.append(NotifyDownstreamReadyWrite);

        handleNotifications();
    }
}