After some playing around I found out that setting the following in the nginx config solves the issue:
proxy_set_header X-Forwarded-Proto https; Since I always want to access my gitlab instance via https, this works well for me and seems to also make oauth possible now. -- You received this message because you are subscribed to the Google Groups "GitLab" group. To unsubscribe from this group and stop receiving emails from it, send an email to gitlabhq+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/gitlabhq/10092cc9-6ee3-4f5a-a7ec-2071da364131%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.