I use a PAC file to provide a network auto proxy.

But the same PAC file works fine in windows/android platform and doesn’t work in MacOS/IOS.

I tested the protocol of the web server for the PAC file(http/https), tested MIME, tested the filename and IP.

Eventually I found out that the alert method in my PAC script would cause this.

So remove it.

test tool: https://thorsen.pm/proxyforurl