Could download a file via HTTPS by browser, but not by a Qt-app.

prog04116

There is a URL containing JPEG file.

Browsers download and show it, but a Qt-app doesn't.

Initially it worked several times, but then:

QNetworkReply::NetworkError 99 (QNetworkReply::UnknownNetworkError), reply->errorString () (one of):

"Connection timed out",
"Unable to write",
"Connection closed"

Sometimes it seems to download, but fails converting into JPEG:

QPixmap::loadFromData() == false

Source code:

    QNetworkAccessManager *nam = getQNetworkAccessManager ();
    QNetworkRequest nrq = QNetworkRequest (QUrl (url));

    nrq.setHeader (QNetworkRequest::UserAgentHeader,  // did not help
                   "Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.43 (KHTML, "
                   "like Gecko) Chrome/95.0.4638.69 Safari/537.36 OPR/81.0.4196.54");

    QNetworkReply *reply = nam->get (nrq);

    connect (reply, &QIODevice::readyRead, rcv, od);
    connect (reply, &QNetworkReply::errorOccurred, rcv, oe);
    connect (reply, &QNetworkReply::sslErrors, rcv, ose);


qDebug() << QSslSocket::sslLibraryBuildVersionString();: "OpenSSL 1.1.1g  21 Apr 2020"
qDebug() << QSslSocket::supportsSsl();: true
qDebug() << QSslSocket::sslLibraryVersionString();: "OpenSSL 1.1.1g  21 Apr 2020"

There are no SSL-errors, onlyQNetworkReply::errorOccurred().

I also asked my firewall to allow the connection.

Will you please help me?

SGaist

Hi and welcome to devnet,

Did you check what is happening with a tool like WireShark ?