I'm using HAVP 0.83 (Gentoo Linux). It seems, there are still problems with HTTP/1.1 pipelined requests (similar to
viewtopic.php?t=69).
If someone uses apt-get to update his ubuntu-installation, HAVP gets "confused" about other peoples requests. Although someone other requests i.e.
http://www.google.com, he will get a white page in his browser.
HAVP log says, that he requested an ubuntu-update-site (and not
http://www.google.com).
Waiting about 3 minutes helps (or restarting HAVP).
After adding "Acquire::http::Pipeline-Depth 0;" to /etc/apt/apt.conf the problem disappears.