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—Checks uploaded files and content; URL-blocking; Web Reputation check; URL Filtering; Retrieving user identity information from LDAP
Response Modification Mode—Checks downloaded files and content
Options—Reports the number of simultaneous connections that can be served
For full compatibility with IWSVA, clients need to set both the Request Modification and Response Modification modes.
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.