QNetworkAccessCacheBackend ignores RedirectPolicyAttribute

#include <QtCore>
#include <QtNetwork>

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

    QNetworkAccessManager nam;
    QObject::connect(&nam, &QNetworkAccessManager::finished, &nam, [](QNetworkReply *reply) {
        QTextStream(stdout) << "Got a " << reply->attribute(QNetworkRequest::HttpStatusCodeAttribute).toInt() << " reply" << (reply->attribute(QNetworkRequest::SourceIsFromCacheAttribute).toBool() ? " from cache" : "") << ": " << reply->url().toDisplayString() << Qt::endl;
        reply->deleteLater();
    });
    auto cache = new QNetworkDiskCache;
    cache->setCacheDirectory("/tmp/qtcache");
    nam.setCache(cache);
    // For clarity -- this is the default value.
    nam.setRedirectPolicy(QNetworkRequest::NoLessSafeRedirectPolicy);

    QTextStream(stdout) << "Forcing a refresh: ";
    QNetworkRequest req1(QUrl("https://qt.io"));
    req1.setAttribute(QNetworkRequest::CacheLoadControlAttribute, QNetworkRequest::AlwaysNetwork);
    auto reply1 = nam.get(req1);
    QObject::connect(reply1, &QNetworkReply::finished, &a, [&]() {
        QTextStream(stdout) << "PreferCache: ";
        QNetworkRequest req2(QUrl("https://qt.io"));
        req2.setAttribute(QNetworkRequest::CacheLoadControlAttribute, QNetworkRequest::PreferCache);
        auto reply2 = nam.get(req2);

        QObject::connect(reply2, &QNetworkReply::finished, &a, [&]() {
            QTextStream(stdout) << "AlwaysCache: ";
            QNetworkRequest req3(QUrl("https://qt.io"));
            req3.setAttribute(QNetworkRequest::CacheLoadControlAttribute, QNetworkRequest::AlwaysCache);

            auto reply3 = nam.get(req3);
            QObject::connect(reply3, &QNetworkReply::finished, &a, &QCoreApplication::quit);
        });
    });

    return a.exec();
}