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What Are PAC Files?

April 26, 2017files PAC

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What Are PAC Files?

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Proxy Automatic Configuration (PAC) files were introduced by Netscape with the release of JavaScript back in 1996, and all modern browsers support them, including Internet Explorer and Opera. PAC files consist of JavaScript defining the function FindProxyForURL(url, host), and are saved with the file type .pac. The return value for this function says whether to use a proxy for this URL, a SOCKS proxy, or connect directly. If your browser is configured to use a PAC file, the FindProxyForURL function is called every time your browser attempts to access a URL, even if JavaScript is turned off in your browser.