KIO::http_post authenticated requests

I am creating some support for reviewboard, since the API is exposed using HTTP_POST, I'm using that. Right now, my main problem is that I need authentication. I was told that it would just work by putting it into the url with QUrl::setUserName and QUrl::setPassword but it's not really working out, I keep getting errors saying I'm not logged in, I'm pretty sure the rest of the request is correct because it works with "curl".

Could someone tell me how can I get to work? Any other code that's doing anything similar?

Thanks, Aleix