Retrieving data from web with QNetworkAccessManager: the file is downloaded but QNetworkReply::readAll returns null - c++

Question

There has been the same question already, but the single answer is not helpful: Qt Download File - QNetworkAccessManager, not getting data
So, I'm trying to download a file:
QNetworkRequest request;
request.setUrl(QUrl(fileUrl));
QNetworkReply * reply = m_nam.get(request);
connect(reply, SIGNAL(finished()), this, SLOT(onDownloadRequestFinished()), Qt::UniqueConnection);
connect(reply, SIGNAL(downloadProgress(qint64, qint64)), this, SLOT(onDownloadRequestProgress(qint64, qint64)), Qt::UniqueConnection);
And in the onDownloadRequestFinished slot:
QNetworkReply * reply = qobject_cast<QNetworkReply *>(sender());
if (reply && reply->error() == QNetworkReply::NoError) {
Q_ASSERT(reply->attribute(QNetworkRequest::HttpStatusCodeAttribute).toInt() == 200);
qDebug() << "reply " << reply->bytesAvailable() << reply->pos() << reply->size() << reply->isReadable() << reply->openMode() << reply->isOpen();
}
The slot prints the following: reply 0 0 0 true OpenMode( "ReadOnly" ) true
So, no data. However, I can clearly see that it does download something somewhere. It's a big file and it does download it, judging from onDownloadRequestProgress.
Important clarification: pretty much the same code works in another project on the same computer. I'm trying to find differences, but see none so far.
Where's the data?

Answer 1

Did you connected readyRead() signal to write bytes received into a specific file?
I always did this to save a file:
const QNetworkRequest& request = QNetworkRequest(url);
reply = qnetworkaccessmanager->get(request);
QObject::connect(reply, SIGNAL(readyRead()), this,
SLOT( readingReadyBytes() ));
then i create my slot:
void yourClass::readingReadyBytes() {
file->write(reply->read(reply->bytesAvailable()));
}