From https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/21870#note_106212058: Now that this MR is merged, `render_503` will be returning the `503` page with the override header set, so Workhorse won't be serving this file, or any error files for that matter. I think we might want to check the `options` parameter for `layout` or `template` before setting this header. /cc: @davidpiegza