It seems macOS does not support local PAC file with URL of "file:///path/to/proxy.pac"

It seems macOS does not support local PAC file with URL of "file:///path/to/proxy.pac". This is sometimes inconvenient. For example, I have to launch a http server to provide this PAC file.

I tried to open "file:///path/to/proxy.pac" with Safari and Chrome. Both Safari and Chrome can access the correct file, although their behaviors are different. When I use this URL to configure auto proxy, both browsers connect to website directly without any failure message, even the PAC file is broken(eg. is empty, has syntax error, return a nonexistent address, etc). When I launch a http server to provide PAC file, both browser work correctly with proxy.

As far as I know, most other desktop OS(eg. Windows and Linux desktop dist) support this feature. Will macOS plan to support this feature or why won't ?

Thanks.