approx - proxy server for Debian archive files
approx responds to HTTP requests made by apt-get(8). It maintains a
cache of Debian archive files that have been previously downloaded, so
that it can respond with a local copy when possible. If a file not in
the cache is requested, approx will download it from a remote Debian
repository and deliver the contents to the client, simultaneously
caching it for future use.
Over time, the approx server cache will grow to contain multiple,
unneeded versions of Debian packages. The approx-gc(8) program removes
these from the cache.
approx is invoked by inetd(8).
Suppose that a client machine’s /etc/apt/sources.list file contains the
deb http://apt:9999/debian testing main
deb http://apt:9999/security testing/updates main
deb-src http://apt:9999/debian unstable main
In this example, apt is the hostname of the approx server machine on
the local network. Each distribution, such as "debian" or "security",
is mapped to a remote repository in the approx server’s configuration
For example, the approx.conf file on the approx server might contain
The mapping scheme is very simple. If the approx.conf file contains
then any request to the approx server of the form
is rewritten to
when there is a "cache miss", and that file is cached as
(Note that the repository name on the left-hand side is not included in
the rewritten URL unless it is explicitly mentioned in the right-hand
side’s initial path.)
Configuration file for approx and related programs.
Cache directory for archive files.
approx.conf(5), inetd(8), approx-import(8), approx-update(8), approx-
gc(8), apt-get(8), sources.list(5)
Eric Cooper <email@example.com>