Redirects are not cached, hence QNetworkRequest::AlwaysCache is useless

NetworkAccessManager::NetworkAccessManager()
    : QNetworkAccessManager(),
      m_cacheControl(QNetworkRequest::PreferNetwork)
{
    QNetworkDiskCache *cache = new QNetworkDiskCache(this);

    // 100 Mb
    cache->setMaximumCacheSize(100*1024*1024);
    cache->setCacheDirectory("cacheDir");

    setCache(cache);

    connect(this, SIGNAL(finished(QNetworkReply*)), this, SLOT(requestFinished(QNetworkReply*)));
}

QNetworkReply *NetworkAccessManager::createRequest(QNetworkAccessManager::Operation op,
                                                     const QNetworkRequest &req,
                                                     QIODevice *outgoingData)
{
    QNetworkReply *reply = 0;

     if(cache())
     {
         QNetworkRequest request(req);

         request.setAttribute(QNetworkRequest::CacheLoadControlAttribute, m_cacheControl);
         request.setAttribute(QNetworkRequest::CacheSaveControlAttribute, true);

         qDebug("Request with cache %d", request.attribute(QNetworkRequest::CacheLoadControlAttribute).toInt());

         reply = QNetworkAccessManager::createRequest(op, request, outgoingData);
     }
     else
         reply = QNetworkAccessManager::createRequest(op, req, outgoingData);

     return reply;
}

void NetworkAccessManager::requestFinished(QNetworkReply *reply)
{
    if(!reply)
    {
        qWarning("Reply is null");
        return;
    }

    qDebug("Finished. Error: %d", reply->error());
}

/**************************************************/

Widget::Widget(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::Widget)
{
    ui->setupUi(this);

    m_manager = new NetworkAccessManager;

    ui->webView->page()->setNetworkAccessManager(m_manager);

    new QShortcut(QKeySequence::HelpContents, this, SLOT(slotHelp()));
}

Widget::~Widget()
{
    delete ui;
}

void Widget::slotGet()
{
    qDebug("GET");
    ui->webView->setUrl(QUrl("http://cnn.com"));
}

void Widget::slotPrefer()
{
    qDebug("Prefer network");
    m_manager->setCacheControl(QNetworkRequest::PreferNetwork);
}

void Widget::slotAlways()
{
    qDebug("Always cache");
    m_manager->setCacheControl(QNetworkRequest::AlwaysCache);
}