Fixes #23246 - branches/tags end with txt product invalid response
What does this MR do?
Fix the invalid API single branches/tags response if it ends with .txt
Are there points in the code the reviewer needs to double check?
Should not. I only enforce the content type of those 2 APIs to application/json, should not have any side effect to others.
Why was this MR needed?
https://gitlab.com/gitlab-org/gitlab-ce/issues/23246
Screenshots (if relevant)
Does this MR meet the acceptance criteria?
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Changelog entry added, if necessary -
Documentation created/updated -
API support added -
Tests added for this feature/bug - Conform by the code review guidelines
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Has been reviewed by a UX Designer -
Has been reviewed by a Frontend maintainer -
Has been reviewed by a Backend maintainer -
Has been reviewed by a Database specialist
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Conform by the merge request performance guides -
Conform by the style guides -
If you have multiple commits, please combine them into a few logically organized commits by squashing them -
Internationalization required/considered -
End-to-end tests pass ( package-and-qamanual pipeline job)