Following redirects changes HTTP verb to GET

    QCoreApplication a(argc, argv);

    int redirectCode = 307;
    QByteArray receivedMethod;
    QTcpServer server;
    server.listen(QHostAddress::LocalHost);
    qDebug() << "Listening at" << server.serverPort();
    QObject::connect(&server, &QTcpServer::newConnection, &a, [&] {
        while (QTcpSocket *socket = server.nextPendingConnection()) {
            QObject::connect(socket, &QTcpSocket::disconnected, socket, &QTcpSocket::deleteLater);
            auto buffer = new QByteArray;
            QObject::connect(socket, &QIODevice::readyRead, &a, [&, socket, buffer] {
                buffer->append(socket->readAll());
                if (!buffer->endsWith("\r\n"))
                    return;
                auto tokens = buffer->split(' ');
                qDebug() << "SERVER: " << tokens[0] << tokens[1];

                QTextStream stream(socket);
                if (tokens[1] == "/redirectme") {
                    stream << QString("HTTP/1.0 %1 Redirectme\r\n").arg(redirectCode);
                    stream << QString("Location: http://localhost:%1/target\r\n").arg(server.serverPort());
                } else {
                    stream << "HTTP/1.0 200 Ok\r\n";
                    receivedMethod = tokens[0];
                }
                stream << "\r\n";
                stream.flush();
                socket->flush();
                socket->close();
                socket->deleteLater();
            });
        }
    });

    QNetworkAccessManager nam;

    for (int code: {301, 302, 303, 307, 308}) {
        qDebug() << "\nTesting redirect code" << code;
        redirectCode = code;

        QNetworkRequest req;
        req.setUrl(QString("http://localhost:%1/redirectme").arg(server.serverPort()));
        req.setAttribute(QNetworkRequest::FollowRedirectsAttribute, true);
        auto reply = nam.sendCustomRequest(req, "PROPFIND");
        qDebug() << "CLIENT sends a request, server will redirect";

        QEventLoop loop;
        QObject::connect(reply, &QNetworkReply::finished, &a, [&]{
            qDebug() << "CLIENT finished. The redirected request method was" << receivedMethod;
            loop.quit();
        });
        loop.exec();
    }