Edge ignores Proxy auto-config (PAC) files

By design Issue #12979608


John I.
Jul 28, 2017
This issue is public.
Found in
  • Microsoft Edge
  • Internet Explorer
Found in build #
Reported by 1 person

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Steps to reproduce

I configure Edge browser to use a proxy setup script but unfortunately the browser ignores the proxy configuration.

The proxy auto-configuration file looks like this:
function FindProxyForURL (url, host)
return "PROXY proxy:443";


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    Comments and activity

    • Microsoft Edge Team

      Changed Assigned To to “Steven K.”

    • Hi John,

      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 u
      sing the ftp:// or file:// protocol for a PAC file.

      The work around is to server the PAC file from a web server.  See the reference link below.


      Thank you for the support,

      The MS Edge Team

    • Microsoft Edge Team

      Changed Status to “By design”

    • EDGE doesn’t read any PAC file at all.
      I have a PAC file set to an http server and it work fine with IE but when I open EDGE there is nothing, it’s just blank doesn’t show or load anything.

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