https://bugs.winehq.org/show_bug.cgi?id=42774
--- Comment #3 from Alistair Leslie-Hughes leslie_alistair@hotmail.com --- (In reply to Hans Leidekker from comment #1)
Created attachment 57788 [details] patch
The issue is that WinHttpQueryAuthSchemes returns when it encounters an unknown scheme where it should proceed with the next header. This patch should fix it.
Any chance of up-streaming it any time soon? ;)