Actually, it looks like this is the same as http://bugs.debian.org/378868. Tcpdumping shows apt in dapper using the full server name in its GET string, which confuses approx (which is not an HTTP proxy, it is a normal web server which just happens to fetch and cache debian packages).
Apt shouldn't be doing this when Acquire::http::proxy == "false", and dapper's apt-setup probably shouldn't be setting Acquire::http::proxy at all in apt.conf when there is no proxy. -- Acquire::http::proxy breaks things with apt proxies like apt-cacher https://launchpad.net/bugs/55813 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
