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Today we started getting a 403 status error on Save with Umbraco 8.16.0 in Azure. I've tried clearing cookies, local cache, bumped client dependency version, rebuilt Examine indexes and restarted the app Service. I happens for all users including Administrators.
Any other things I should try?

BTW, I'm getting an html page response instead of json from the postSave call and it says 'Enable JavaScript and cookies to continue'

In case anyone else get caught out by this:
I turns out Cloudflare rules changed on 1st May and they implemented an automatic challenge on the OWASP rules threshold (probably because html was being submitted). That's why the weird message about enabling JavaScript was returned. It was the Cloudflare 'challenge response'.