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-<section xmlns="http://docbook.org/ns/docbook"
-         xmlns:xlink="http://www.w3.org/1999/xlink"
-         xmlns:xi="http://www.w3.org/2001/XInclude"
-         version="5.0"
-         xml:id="ssec-binary-cache-substituter">
-
-<title>Serving a Nix store via HTTP</title>
-
-<para>You can easily share the Nix store of a machine via HTTP. This
-allows other machines to fetch store paths from that machine to speed
-up installations. It uses the same <emphasis>binary cache</emphasis>
-mechanism that Nix usually uses to fetch pre-built binaries from
-<uri>https://cache.nixos.org</uri>.</para>
-
-<para>The daemon that handles binary cache requests via HTTP,
-<command>nix-serve</command>, is not part of the Nix distribution, but
-you can install it from Nixpkgs:
-
-<screen>
-$ nix-env -i nix-serve
-</screen>
-
-You can then start the server, listening for HTTP connections on
-whatever port you like:
-
-<screen>
-$ nix-serve -p 8080
-</screen>
-
-To check whether it works, try the following on the client:
-
-<screen>
-$ curl http://avalon:8080/nix-cache-info
-</screen>
-
-which should print something like:
-
-<screen>
-StoreDir: /nix/store
-WantMassQuery: 1
-Priority: 30
-</screen>
-
-</para>
-
-<para>On the client side, you can tell Nix to use your binary cache
-using <option>--option extra-binary-caches</option>, e.g.:
-
-<screen>
-$ nix-env -i firefox --option extra-binary-caches http://avalon:8080/
-</screen>
-
-The option <option>extra-binary-caches</option> tells Nix to use this
-binary cache in addition to your default caches, such as
-<uri>https://cache.nixos.org</uri>. Thus, for any path in the closure
-of Firefox, Nix will first check if the path is available on the
-server <literal>avalon</literal> or another binary caches. If not, it
-will fall back to building from source.</para>
-
-<para>You can also tell Nix to always use your binary cache by adding
-a line to the <filename linkend="sec-conf-file">nix.conf</filename>
-configuration file like this:
-
-<programlisting>
-binary-caches = http://avalon:8080/ https://cache.nixos.org/
-</programlisting>
-
-</para>
-
-</section>