Viewing a file in the "HEAD" branch yields a 404 "history" link (404 links produced when viewing symbolic ref)

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Summary

Open these two links:

• https://gitlab.com/gitlab-org/gitlab-ce/blob/master/README.md
• https://gitlab.com/gitlab-org/gitlab-ce/blob/HEAD/README.md

Clicking "history" produces a 404 for HEAD but not for master. I.e. this link (https://gitlab.com/gitlab-org/gitlab-ce/commits/master/README.md) works, but this one fails: https://gitlab.com/gitlab-org/gitlab-ce/commits/HEAD/README.md

Steps to reproduce

See above. This is on gitlab.com running 11.7.4-ee, we run 11.6.5-ee and see the same issue. I'm pretty sure (but have not confirmed) that this used to work in some recent-ish version, and that this is a regression.

Why is this needed?

It's handy to be able to link to the HEAD branch from tools that given some filename in the project just want to be able to browse it at the latest version, whether the HEAD symbolic ref points to master, trunk or something else.