Other users with similar issues: https://github.com/supabase/supabase/issues/20982#issuecomment-2944288493

Sorry any news about this issue, that is still an issue? Is this any bug from safari, can you confirm anything?

No one replies to the feedback... (https://feedbackassistant.apple.com/feedback/19582986) ? The problem is still on going...

Can you see the feedback Id I provided (FB19582986)? Thanks.

Hello, Any news about this issue? Feedback Id: FB19582986 Yes, server has a short keep-alive 1s timeout as explained. It always worked in other browsers (Chrome, Android, etc.) and even Safari versions before 18. Changing timeout to 30s doesn’t solve the issue, it only postpones it. If user triggers a request just before the timeout the connection may already be closed when reaches server, and the request will still fail. We’re aware of HTTP/2 and 3, but that’s not doable at moment Thanks.

https://stackoverflow.com/questions/75794431/safari-localstorage-login-from-sub-domain-com-to-domain-com