The page served at `/gitlab_auth` tries to source an image that does not exist. The bad URL is in [gitlab_auth.tmpl](https://github.com/cesanta/docker_auth/blob/69aa6300780fe62ef4860abee63c5226dea7dc6d/auth_server/authn/data/gitlab_auth.tmpl#L33). Current GitLab logos and brand assets can be found here: https://about.gitlab.com/press/press-kit/. <details><summary>screenshot</summary>  </details>