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void ClassName::start()
{
    QNetworkAccessManager *manager = new QNetworkAccessManager();
    QNetworkRequest request;
    request.setUrl(url);
    QNetworkReply *reply = manager->get(request);
    connect(reply, SIGNAL(readyRead()), this, SLOT(readyRead()));
}

void ClassName::readyRead()
{
    QNetworkReply* reply = qobject_cast<QNetworkReply*>(QObject::sender());
    allData.append(reply->readAll());     
}