How to fix '400 bad request error' in Safari on iPad?
When I try to open certain websites I get message 400 bad request
header or cookie too large
[Re-Titled by Moderator]
iPad, iPadOS 18
You can try deleting cookies for the site(s) in question.
Check Settings -> Safari -> Advanced -> Website Data
Scroll to find the web site in question (or type in the search bar) and delete.