QNetworkAccessManager Qt 5.7.1 strange behavior

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I'm developing a simple application with QNetworkAccessManager, I'm able to fire http requests and receive replies but everytime I instantiate a QNetworkAccessManager object, my application starts writing on the shell a "Not supported" message. I tried compiling the sample appication http://doc.qt.io/qt-5/qtnetwork-download-example.html with the same behavior... somone has experienced the same problem? Should I instantiate the QNetworkAccessManager objecton Qt 5.7.1 using particular setting? (unfortunately I can't update to Qt 5.11) Any help would be greatly appreciated

QNetworkAccessManager *manager = new QNetworkAccessManager(this);

connect(manager, SIGNAL(finished(QNetworkReply*)), this, SLOT(replyFinished(QNetworkReply*)));

QNetworkRequest *request = new QNetworkRequest(QUrl("http://www.someurl.com"));

manager->get(*request);