Proxy auto config didn't work on beta versions of iOS 15. But today I upgraded to iOS 15 (release candidate), but proxy auto config still doesn't work. Previously, I didn't submit a report on this, because I didn't know where to place this report (in the Feedback application). Thought someone else would send this report. Now I can't send it, because I deleted iOS 15 beta profile. Tried turning off the private relay but it didn't work for me. This bug is also observed in iPadOS 15 (release candidate).
P.S. Sorry for my English.
https://developer.apple.com/documentation/ios-ipados-release-notes/ios-ipados-15-release-notes
Support for cleartext HTTP URL schemes for Proxy Automatic Configuration (PAC) is now deprecated. Use only HTTPS URL schemes for PAC. This affects all PAC configurations, including, but not limited to, configurations set via Settings, System Preferences, profiles, and URLSession APIs such as connectionProxyDictionary and CFNetworkExecuteProxyAutoConfigurationURL(::::). If you configure a cleartext HTTP PAC URL, the system may upgrade it to HTTPS during PAC file loads. Web Proxy Auto-Discovery (WPAD) Protocol via DNS isn’t affected. Dynamic Host Configuration Protocol (DHCP) Option 252 WPAD may attempt to upgrade cleartext HTTP URLs to HTTPS during PAC file loads. (61981845)