QML XMLHttpRequest and proxy

alejandro_pnz

By default, Qt XMLHttpRequest doesn't have any possibility to set network proxy.
Do we have any alternatives to send network request from QML, using network proxy?

qyvlik

Qt version 5.13.2
QML XMLHttpRequest implement and wrapper as follow

The QQmlXMLHttpRequest have QNetworkAccessManager type member m_nam, set m_nam code as follow:

 QQmlXMLHttpRequest *r = new QQmlXMLHttpRequest(scope.engine->v8Engine->networkAccessManager(), scope.engine);

You can use the api void QQmlEngine::setNetworkAccessManagerFactory(QQmlNetworkAccessManagerFactory *factory) defined you own QNetworkAccessManager.

class MyNetworkAccessManager : public QNetworkAccessManager
{
    Q_OBJECT
public:
    MyNetworkAccessManager(QObject* parent=nullptr):
        QNetworkAccessManager(parent)
    {}

protected:
    QNetworkReply *createRequest(QNetworkAccessManager::Operation op, const QNetworkRequest &originalReq, QIODevice *outgoingData = nullptr) {

#ifdef QT_DEBUG
        qDebug() << Q_FUNC_INFO << "url:" << originalReq.url();
#endif
        // do something before request
        // set the cookie
        // set proxy
        // ...
        return this->QNetworkAccessManager::createRequest(op, originalReq, outgoingData);
    }
};

class CacheableNetworkAccessManagerFactory : public QQmlNetworkAccessManagerFactory
{
public:
    // use by xmlhttprequest
    // use by qml type such Image
    virtual QNetworkAccessManager *create(QObject *parent) {
         QNetworkAccessManager *nam = new MyNetworkAccessManager(parent);

//        QNetworkAccessManager *nam = new QNetworkAccessManager(parent);
        QNetworkDiskCache* diskCache = new QNetworkDiskCache(nam);

        QString cachePath = QStandardPaths::displayName(QStandardPaths::AppDataLocation) + "/image-cache";

        diskCache->setCacheDirectory(cachePath);
        diskCache->setMaximumCacheSize(100 * 1024 * 1024);   // 100 MB

        nam->setCache(diskCache);

#ifdef QT_DEBUG
        qDebug() << Q_FUNC_INFO << " cachePath:" << diskCache->cacheDirectory();
#endif
        return nam;
    }
};

If you want use prue qml to set http proxy, try the 3rdparty library.