QWebSocket Incorrect http upgrade request parsing

void QWebSocketServerPrivate::handshakeReceived()
{
    if (Q_UNLIKELY(!currentSender)) {
        return;
    }
    QTcpSocket *pTcpSocket = qobject_cast<QTcpSocket*>(currentSender->sender);
    if (Q_UNLIKELY(!pTcpSocket)) {
        return;
    }
    //When using Google Chrome the handshake in received in two parts.
    //Therefore, the readyRead signal is emitted twice.
    //This is a guard against the BEAST attack.
    //See: https://www.imperialviolet.org/2012/01/15/beastfollowup.html
    //For Safari, the handshake is delivered at once
    //FIXME: For FireFox, the readyRead signal is never emitted
    //This is a bug in FireFox (see https://bugzilla.mozilla.org/show_bug.cgi?id=594502)
    if (!pTcpSocket->canReadLine()) {
        return;
    }

if (!pTcpSocket->canReadLine()) {
        return;
    }

// According to RFC822 the body is separated from the headers by a null line (CRLF)
if (!pTcpSocket->peek(pTcpSocket->bytesAvailable()).endsWith(QByteArrayLiteral("\r\n\r\n"))) {	
    return;	  
}