What is a PAC file?

A Proxy Auto-Configuration (PAC) file defines how a web browser should choose an appropriate proxy server for fetching a given URL. PAC files are written in JavaScript and can be easily written and maintained (…more).

What is WPAD?

The Web Proxy Autodiscovery Protocol (WPAD) is a method used by web browsers to automatically locate a PAC file using DHCP and DNS (…more).

Are these technologies widely supported?

PAC and WPAD support can be found in all major browsers, including, but not limited to, Internet Explorer, Firefox, Opera, Chrome, and Safari (…more).