ISA Web Proxy Architecture

Microsoft Internet Security and Acceleration Server 2000

ISA Web Proxy Architecture

The ISA Web proxy service is implemented as a separate service called w3proxy. Functions provided by this service include:

Configurable network connections for forward and reverse proxy.
Parsing of HTTP 1.1 protocol headers.
HTTP 1.1 proxy authentication of client requests.
Web filter-notification support.

Note to Developers of Web Filters for Internet Information Services

There are several differences between the implementation of ISAPI in Internet Information Services (IIS) and in ISA. These are described in ISAPI: Comparing IIS and ISA.