Hosted PAC: hosting the file on a Web server is the most popular and widely supported method. If the location of the PAC file is password protected then this is likely to prevent the browser from downloading the file. Share PAC: the file can be hosted on a Windows share, assuming that the share is accessible to the machine and that the correct permissions have been applied.Rules can be specified in the PAC file to allow direct Internet access when off-network. Local PAC: in some cases it may be appropriate to host the file on the local machine, this can be useful if the machine is likely to leave the network and doesn't have Anywhere+ installed.There are three ways to deploy a PAC file: This can be used if you need to exception a section of a Web site from going via the Web Scanning Services if the user had requested only, this rule would not apply:Īlthough a PAC file can have any name, normally it should be called proxy.pac. If the URLs match, the PAC file will instruct the browser to send the request direct to the Internet. The following example compares the URL requested by the user, with the URL /data/. The host, for example cnn.com, the URL, for example cnn.com/images/logo.jpg, and other information such as the local machine IP address can be evaluated and rules based on this information used to determine whether to send the traffic via a proxy or direct to the Internet. How PAC Files WorkĪ PAC file is referenced each time a new URL is loaded. This appendix explains the basics of using PAC files. Browsers can be configured to use the file either manually or, in Microsoft Windows environments, automatically using Group Policy Objects. This file can be hosted locally or on a network. The method for choosing a proxy is written as a JavaScript function contained in a PAC file. Proxy Auto-Configuration (PAC) is a method used by Web browsers to select a proxy for a given URL.
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