How to remove the Authorization header from a http request

Tusharh

I want to remove the 'Authorization: ' header from my GET request fired. QT by default adds it.

Sample of request fired -
GET https://mywebsiteurl.com/remote.php/webdav/3.txt HTTP/1.1

Authorization: Basic Og==
User-Agent: Mozilla/5.0 (Linux) myapp/1.2.1
Connection: Keep-Alive
Accept-Encoding: gzip, deflate
Accept-Language: en-US,*

I don't want the Authorization header. I completely want to remove it from my request fired.
End result should be as below-

GET https://mywebsiteurl.com/remote.php/webdav/3.txt HTTP/1.1
User-Agent: Mozilla/5.0 (Linux) myapp/1.2.1
Connection: Keep-Alive
Accept-Encoding: gzip, deflate
Accept-Language: en-US,*

I have written sample code -

QNetworkAccessManager* mgr = new QNetworkAccessManager();
....
QNetworkRequest req;
req.setUrl(QUrl("sampleURL") );
mgr->get(req);
.....
Thanks in advance..!!