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Windows 10 does not read a PAC file referenced by a file protocol（file:///C:/Users/chenx/Desktop/V2RayGCon-full/black.pac）
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.
solution:
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
problem solved.
