Why this code not record var "Source" to file?

[lapdx]

QNetworkRequest request;
networkManager = new QNetworkAccessManager(this);
request.setUrl(QUrl("http://qt.nokia.com"));
request.setRawHeader("User-Agent", "MyOwnBrowser 1.0");
networkReply = networkManager->get(request);
networkReply=networkManager->put(request,source);


QFile file("out1.txt");
file.open(QIODevice::WriteOnly | QIODevice::Text);
file.seek(0);
file.write(source);
file.close();