If the DHCP server does not provide the desired information, DNS is used. The WPAD standard defines two alternative methods the system administrator can use to publish the location of the proxy configuration file, using the Dynamic Host Configuration Protocol (DHCP) or the Domain Name System (DNS):īefore fetching its first page, a web browser implementing this method sends a DHCPINFORM query to the local DHCP server, and uses the URL from the WPAD option in the server's reply.
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Web Proxy Auto-Discovery Protocol (WPAD) standard: ensure that an organization's browsers will find this file without manual configuration.Details are discussed in a separate article.
Proxy auto-config (PAC) standard: create and publish one central proxy configuration file. In order for all browsers in an organization to be supplied the same proxy policy, without configuring each browser manually, both the below technologies are required: WPAD was first included with Internet Explorer 5.0. However, WPAD is still supported by all major browsers. WPAD is documented in an INTERNET-DRAFT which expired in December 1999. The WPAD protocol was drafted by a consortium of companies including Inktomi Corporation, Microsoft Corporation, RealNetworks, Inc., and Sun Microsystems, Inc. The WPAD protocol only outlines the mechanism for discovering the location of this file, but the most commonly deployed configuration file format is the proxy auto-config format originally designed by Netscape in 1996 for Netscape Navigator 2.0.
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