Visit a random page on mobile on the beta cluster (this does not impact production):
Make an edit and save.
At the bottom of the page click the last modified bar "Last edited by" to get to the history page.
Click the first entry.
Expected: The diff will render
Actual: A 503 occurs
Upon refreshing a few times the page shows.
This seems to be easy to replicate.
== Acceptance criteria
 Fix the issue
 Revert [[ https://gerrit.wikimedia.org/r/380520 | I6be3b234d3084796b039bd6610364e1600e82157 ]]