Setting https_proxy worked for me. It sounds like the real source of confusion surrounding this issue is that the default /etc/sudoers configuration does not pass through http_proxy, https_proxy, ftp_proxy, all_proxy, etc (see bug #556293).
Setting https_proxy worked for me. It sounds like the real source of confusion surrounding this issue is that the default /etc/sudoers configuration does not pass through http_proxy, https_proxy, ftp_proxy, all_proxy, etc (see bug #556293).