@Lucky01
So far you have asked about Laravel and SQL in PHP. Why do you want to use this forum if you are using them and not Qt? Beats me.

@Paul-Colby thanks this is really helpful

@JonB I also thought it could be due to cache, so I ran the manager.clearConnectionCache command but that does not help.

I also tried to find a way to force it to provide credentials but I have not found any other way to do so. But that was when I still wasn't sure that the server actually requests this, but since I now know that the server sends the www-authenticate request I know the error is in my applicaton or in qt.

Yes, I get the QNetworkReply::AuthenticationRequiredError. So weird that I get that error and not the authenticationRequired signal.

@gollum
Sorry I still don't understand who's authenticating where and how is oauth2 involved in all this.

I could use cookies as well which might make things easier.

I would think you not only could, but rather need to use cookies. How else will you distinguish between clients connected to you PHP service?

Thank you. I take a look on it.