QNetworkAccessManager zwraca pusty string

    QNetworkAccessManager * manager = new QNetworkAccessManager(this);
    connect(manager, SIGNAL(finished(QNetworkReply*)), this, SLOT(fileIsReady(QNetworkReply*)) );
    manager->get(QNetworkRequest(QUrl("http://4programmers.net")));


void tv::fileIsReady(QNetworkReply *reply)
{
    QTemporaryFile temp_file;
    temp_file.write(reply->readAll());
    qDebug() << temp_file.readAll();
 }

temp_file.open();
// write
temp_file.flush();

  QEventLoop loop;
    connect(manager, SIGNAL(finished(QNetworkReply*)), &loop, SLOT(quit()));
    QNetworkReply *reply = manager->get(QNetworkRequest(QUrl("4programmers.net")));

    loop.exec();

    if(reply->error() == QNetworkReply::NoError)
    {
        QByteArray bytes = reply->readAll();
               QString string(bytes);
               qDebug() << string;
    }
    else
    {
        qDebug() << "reply error";
    }