Misconfigured redirects/vhosts
From https://hackerone.com/reports/361003:
https://feedback.gitlab.com/ currently presents an error from fastly.
Marking as ~S2 because feedback.gitlab.com is still linked from the handbook.
The following respond with 404, but release-9-1.about.gitlab.com has the same IP as about-src.gitlab.com and just redirects to about.gitlab.com:
- release-8-16.about.gitlab.com
- release-9-1.about.gitlab.com