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Under Select a protocol to configure, select Automatic Proxy Configuration.To edit the Automatic Proxy Configuration settings in Mac operating system, follow these steps: To resolve this problem, host the PAC file on a web server that can be accessed by using the HTTP protocol, and then specify the URL of the file in the Automatic Proxy Configuration setting of the Advanced Network preferences in Mac operating system.

A file-based PAC file is a file whose URL begins with file://.

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