I am working a QtWebKit bug https://bugs.webkit.org/show_bug.cgi?id=36688, which runs LayoutTests/http/tests/appcache/auth.html.
I have investigated the issue and it looks to me the problem is under QNetwork layer.
The test case will send several http requests in a row. The first one to "setup.php" contains the login/password info and it went through. The second request to "iframe.php" does not contain user/password in its url and theQNetwork layer is supposed to fetch the credential from its cache. However, I didn't see the credential was saved to cache before this. I think after the successful return of the 1st request, the credential should be saved.