A proxy auto-config (PAC) file defines how web browsers and other user agents can automatically choose the appropriate proxy server for fetching a given URL.

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Filter HTTPS URLs with non-transparent proxy

I have set up a Squid v.3.1 + Squidguard, the proxy is configured on each browser via a proxy.pac file. Now if an user goes to a blocked site with HTTP (e.g. http://www.facebook.com) the Url filter ...
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How can I debug PAC (proxy auto config) on Windows 8.1 (IE11 and Modern UI)?

On older systems such as Windows 7 + IE10, calling "alert()" in the PAC file would cause a dialog being shown. However, with Windows 8.1 no dialogs are displayed even if IE11 seems to be making use ...
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proxy auto configuration file requests

What might be causing bursts of 10 - 20 proxy auto config file requests? I am seeing bursts of requests for our PAC file, which is hosted on an internal Apache server. Some bursts are up to 20 per ...
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Internet Explorer proxy pac files

We have a simple pac file used for staff in work and at home: function FindProxyForURL(url, host) { /* Exclude "Portico" URL */ if (shExpMatch(url, "*google.com*")) { return ...