Wikimedia Bugzilla is closed!

Some wikis like to put helpful forms in their MediaWiki:Noarticletext to assist in article creation, searching, and the like. And the vast majority of wikis have a search box on every page.

However, with 404s being served almost everywhere Noarticletext is shown (and possibly due to the must-revalidate and zero's maxage headers), these pages are uncacheable in certain browsers (at least some /most Mozilla derivatives), so entering information into these forms, submitting, and then clicking 'back' results in a complete page re-fetch and erasure of any form inforation.

There may be no way to solve this without removing the 404 status codes.