Comment 8 for bug 156070

Yes, I've tested that it works. Here's a transcript (I changed some of
the names though)..

myusername@myserver:~$ cat /usr/share/apt-cacher/apt-cacher | grep "gpg"
     'Release.gpg',
     '[:alpha:]*\.tar\.gz\.gpg$'
myusername@myserver:~$ export http_proxy=http://localhost:3142/
myusername@myserver:~$ wget -c
http://ftp.kaist.ac.kr/ubuntu/dists/intrepid/main/dist-upgrader-all/current/intrepid.tar.gz.gpg
--10:32:50-- http://ftp.kaist.ac.kr/ubuntu/dists/intrepid/main/dist-upgrader-all/current/intrepid.tar.gz.gpg
           => `intrepid.tar.gz.gpg'
Resolving localhost... 127.0.0.1
Connecting to localhost|127.0.0.1|:3142... connected.
Proxy request sent, awaiting response... 200 OK
Length: 189 [text/plain]

100%[====================================>] 189 --.--K/s

10:32:50 (12.92 MB/s) - `intrepid.tar.gz.gpg' saved [189/189]

Hope this helps.