Filter JSON files 404 on issues page

Summary

Not able to filter on issues page with a trailing slash

Steps to reproduce

• Go to https://gitlab.com/gitlab-org/gitlab-ce/issues/ (include trailing slash)
• Try to filter by label

Expected behavior

• Display list of filter values

Actual behavior

• 404 for https://gitlab.com/gitlab-org/gitlab-ce/issues/labels.json
• spinner just keeps spinning

Relevant logs and/or screenshots

application-8d6d787….js:20 GET https://gitlab.com/gitlab-org/gitlab-ce/issues/labels.json 404 (Not Found)

assigned to @alfredo1

cc @DouweM @rspeicher @stanhu

@psimyn When you make these issues make sure to cc the right people at the bottom.

@jschatz1 I do have a fix that I'm finishing. The problem was that the AJAX request was using the current path as base.

mentioned in merge request !9010 (merged)

added regression label

mentioned in issue #26770 (closed)

added ~978334 label

closed via merge request !9010 (merged)

mentioned in commit siemens/gitlab-ce@6d971201