Comment 2 for bug 512691

Right, the reason httplib is used in some places is because urllib2 doesn't appear to provide an obvious interface to do an HTTP HEAD request in order to get whether or not a file exists on the server without pulling down the whole thing. That said, I've come up with a way that I think is working, but it would be nice to get verification from someone actually using a proxy. Can someone please test the version in https://code.launchpad.net/~ubuntu-bugcontrol/ubuntu-qa-tools/master , revision 334 or newer? Thanks!