Comment 7 for bug 773823

Addressing what I think is your original request, if not the bug you submitted here, why not use a caching proxy instead of a local mirror? you could add something like this to /etc/apt/apt.conf.d/02proxy:

Acquire::http { Proxy "http://apt.example.com:3142"; };

Something like apt-cacher-ng might do the trick for you.