Jul 3 2019
Could you add some symptoms to this so one finds it . It surfaced for me as an HTTP 400 posting hundreds of edits to my wiki. Was particularly hard to debug because the cookies and not my edits were causing the BAD REQUEST. I'd definitely add HTTP 400 Mediawiki API and would recommend adding Apache, cURL and PHP to avoid having everyone automating edits through the API having to debug the cryptic error message BAD REQUEST.