Last modified: 2005-10-28 09:42:11 UTC
HTTP status 4xx are not cachable.
When I edit non-existing article, press preview, and press back button,
browser flushes page data and reloads or re-posts previous posted data.
action=edit and action=submit should respond HTTP 200 anytime.
Was changed a while ago. However, these pages are already not cacheable so... ?