Comment 23 for bug 556293

I can tell you that as a user of Ubuntu systems behind firewalls (where the only way to get out is an HTTP proxy), I would *always* want http_proxy to be passed through. Otherwise, if I want to run something that connects via http to the Internet, I have to do:

$ sudo -i
Password:
# export http_proxy=http://myproxy:8080/
# <command>

That's a lot of typing for every command, and it tempts me to just leave a root shell open instead of using 'sudo'.

It is important to note that if http_proxy is allowed through, no_proxy should also be allowed through. Otherwise, if I have a mix of internal and external .deb sources, apt-get still won't work. For an example, see:

http://serverfault.com/questions/42426

I suppose this implies that ftp_proxy should also pass through, for a complete solution.