You can install IWSVA—in the so-called "ICAP mode"—to work with many Internet Content
Adaptation Protocol (ICAP) v1.0 compliant proxy servers, however, you need to make
the choice before installation.
When in ICAP mode, the ICAP proxy will forward HTTP responses and requests to IWSVA
and keep track of the results.
ICAP includes the following methods:
-
Request Modification Mode
(REQMOD)—Checks the contents of HTTP requests and uploaded files & content
-
Response Modification Mode
(RESPMOD)—Checks downloaded files and content
-
Options—Reports the number of simultaneous connections that can be served
For full compatibility with IWSVA, ICAP clients need to set both the Request Modification
and Response Modification modes.
Background
ICAP was introduced in response to the fast growth of proxy services on the Internet.
As proxy servers became increasingly complicated and began including functions such
as translation, virus filtering, and caching, the need to distribute the load across
multiple machines arose. In 1999, the ICAP Forum was established to introduce a standard
protocol for communication between proxy-solutions, and service-providers such as
IWSVA.
