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Co-authored-by: Robert Hensing <roberth@users.noreply.github.com>
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doc/manual/src/protocols/tarball-fetcher.md
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# Serving Tarball Flakes
# Lockable HTTP Tarball Protocol
Tarball flakes are served as regular tarballs via HTTP or the file
system (for `file://` URLs).
Tarball flakes can be served as regular tarballs via HTTP or the file
system (for `file://` URLs). Unless the server implements the Lockable
HTTP Tarball protocol, it is the responsibility of the user to make sure that
the URL always produces the same tarball contents.
An HTTP server can return an "immutable" flakeref appropriate for lock
An HTTP server can return an "immutable" HTTP URL appropriate for lock
files. This allows users to specify a tarball flake input in
`flake.nix` that requests the latest version of a flake
(e.g. `https://example.org/hello/latest.tar.gz`), while `flake.lock`
will record a URL whose contents will not change
(e.g. `https://example.org/hello/<revision>.tar.gz`). To do so, the
server must return a `Link` header with the `rel` attribute set to
server must return an [HTTP `Link` header](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Link) with the `rel` attribute set to
`immutable`, as follows:
```