List of steps to reproduce (step by step, including full links if applicable):
- Go to https://commons.wikimedia.beta.wmflabs.org/wiki/Special:Undelete/File:2014-06-18_Rheinwerk_1.jpg
What happens?:
Request from - via deployment-cache-text06.deployment-prep.eqiad.wmflabs, ATS/8.0.8
Error: 502, Next Hop Connection Failed at 2021-10-18 20:48:49 GMT
What should have happened instead?:
View and restore deleted pages
This isn't universal though, for example Special:Undelete/File:Hauz-i-Shamsi.jpg works fine. Also note that 120px-2014-06-18_Rheinwerk_1.jpg results in:
Request from (my ip) via deployment-cache-upload06 deployment-cache-upload06, Varnish XID 6725866
Upstream caches: deployment-cache-upload06 int
Error: 421, Misdirected Request at Mon, 18 Oct 2021 20:55:52 GMT
As opposed to the 404 you'd get for Hauz-i-Shamsi.jpg. (on production you'd get a 404 as well)
@Lucas_Werkmeister_WMDE found this in T293070.