Originally from here
HAVP (HTTP AntiVirus proxy) is a proxy with an anti-virus filter. It does not cache or filter content and in this how-to it is set as a parent proxy of squid, i can be run on it’s own.
Function: proxy caching server for web clients
Name: HAVP (HTTP anti-Virus Proxy)
Function: HAVP (HTTP AntiVirus proxy) is a proxy with an anti-virus filter