Steps to reproduce
- Visit https://www.mediawiki.org/w/index.php?title=Reading/Web/Chores&veaction=editsource anonymously or logged in
- An HTTP 503 error dialog appears.
The failed request is https://www.mediawiki.org/w/api.php?action=visualeditor&format=json&paction=wikitext&page=Reading%2FWeb%2FChores&uselang=en:
Request from 73.181.4.128 via cp1083 cp1083, Varnish XID 767017918 Error: 503, Backend fetch failed at Wed, 13 Mar 2019 20:15:52 GMT