@lapcatsoftware Hi Jeff, did you ever get a reply on your Webkit bug report you mentioned at the end of https://lapcatsoftware.com/articles/2024/12/1.html? With the failed loading of localhost URLs? I seem to be getting it with all websites since some time, even with the “Warn before connecting to a website over a non-secure connection” option disabled.
How Safari 18.2 https upgrade works

284559 – Safari 18.2 non-secure site connections warning blocks localhost with no option to proceed

WebKit Bugzilla