Comment 3 for bug 446552

Thanks Daniel for the bug and the fix. I know its not a ideal fix, but it should be good enough (and most importantly minimal enough) for jaunty. I do some investigation now into a fix based on urrlib2 (it just need to be made to do a HEAD request on http and a size() rquest on ftp). But init_proxy() should deal with all the common cases for setting up http_proxy