Windows 10 does not read a PAC file referenced by a file protocol（
This issue occurs because Internet Explorer and Edge on Windows 10-based computers use the WinHttp proxy service to retrieve proxy server information. The WinHttp Proxy service does not support using the ftp:// or file:// protocol for a PAC file.
To resolve this issue, host the PAC file on a web server, then refer to it by using the http protocol.
so I upload my pac file to qiniu cloud