Qt Imgur上传失败

我有一个像这样的上传器

void uploader::upload() {
    QUrl serviceUrl = QUrl("http://api.imgur.com/2/upload.json");
    QByteArray postData;

    postData.append("key=MY_KEY&");
    postData.append("image=" + file.toBase64());

    QNetworkAccessManager *networkManager = new QNetworkAccessManager(this);
    connect(networkManager, SIGNAL(finished(QNetworkReply*)), this, SLOT(serviceRequestFinished(QNetworkReply*)));
    networkManager->post(QNetworkRequest(serviceUrl), postData);
}

void uploader::serviceRequestFinished(QNetworkReply* reply) {
    qDebug() << "Done" << endl;
    QString response = reply->readAll();

    qDebug() << response;

    QScriptValue sc; 
    QScriptEngine engine;
    sc = engine.evaluate(response);

    qDebug() << sc.property("upload").property("links").property("original").toString();
}

void uploader:：upload（）{
QUrl serviceUrl=QUrl（“http://api.imgur.com/2/upload.json");
QByteArray postData；
append（“key=MY\u key&”）；
postData.append（“image=“+file.toBase64（））；
QNetworkAccessManager*networkManager=新的QNetworkAccessManager（此）；
连接（networkManager，信号（完成（QNetworkReply*）），此插槽（serviceRequestFinished（QNetworkReply*））；
networkManager->post（QNetworkRequest（serviceUrl）、postData）；
}
无效上载程序：：serviceRequestFinished（QNetworkReply*reply）{
qDebug（）