I played with this package a few months ago and did not have luck with it.
Tried it again after reading this post. (dvserg's point to doc post).
It works great transparent off on squid, on on hvap.
Did a proxy test and found hvap, and did an ecar test and hvap blocked the page. It did let the download go though though (client antivirus got it), so I know I have a bit more to play with the file setting....
What I did not get to work was hvap + squid + squidguard. When hvap is off, and I just use squid+squidguard everything works. If I turn transparent off in sqid and turn on hvap in transparent, I see that hvap is found as the proxy and I can browse. The problem is that there is no blocking via squidguard. Any way to enable squid + sqidguard?
General question, how do I tell if squid is even working behind hvap? Maybe hvap is doing the proxy, but bypassing squid altogether?