'Resolve discussion' button does not work

We create some merge request and write some comment in 8.10. After upgrading to 8.11.4, I tried to 'Resolve discussion', but progress icon on button does not stop. Therefore, I confirmed logs on the GitLab server and a web browser, discover that a web browser access to illegal url.

My GitLab service is operated with sub uri (relative url). But a web browser access to server without relative url path.
So server returns 404 error, a progress icon on 'Resolve discussion' button never stop.

My gitlab.yml settings (extract)

gitlab:
  host: my.gitlab.example.com
  port: 80
  ....
  relative_url_root: /gitlab

Accessed URL: http://my.gitlab.example.com/GROUP/REPOSITORY/merge_requests/NUM/discussions/HASH/resolve

Status changed to closed

@natch Thanks for reporting. This is a known regression in GitLab 8.11.4 and is scheduled to be fixed in 8.11.5 - See https://gitlab.com/gitlab-org/gitlab-ce/issues/21704

Added ~12980 ~13921 regression labels

Sorry for reporting duplicate issue. Thank you for your prompt reply.

@natch No problem! 🎉, glad we could help!