#include <QCoreApplication>
#include <QNetworkAccessManager>
#include <QNetworkRequest>
#include <QNetworkReply>
#include <QAuthenticator>

int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);

    QNetworkAccessManager nam;
    auto authProvided = false;

    QObject::connect(&nam, &QNetworkAccessManager::authenticationRequired,
                     [&](QNetworkReply *reply, QAuthenticator *authenticator)
    {
        if (!authProvided)
        {
            auto realm = authenticator->realm();
            authenticator->setUser("ftptester");
            authenticator->setPassword("OhBaifalee8m");
            authProvided = true;
        }
    });

    QNetworkRequest request(
                QUrl("ftp://208.88.224.211:21/testfile128"));
    auto reply = nam.get(request);

    QObject::connect(reply, &QNetworkReply::finished,
                     [=]()
    {
        auto error = reply->error();
        auto errStr = reply->errorString();
        auto ok = error == QNetworkReply::NoError;
        QCoreApplication::quit();
    });

    return a.exec();
}