Squidclamav since version 6.x works as an icap service through the c-icap server. it is faster than previous v5.x releases and also remove old limitation on post request, sites with sessions like webmail and audio/video streaming. the v6.x branch still allow chaining squidguard with high performance.

for interaction with the user, an cgi script is used, so an webserver witch cgi supports is need wihtin your network or on the same host.