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The code is distributed along with recent versions of Traffic Server, in the " plugins/experimental/metalink " directory. To build it, pass the " --enable-experimental-plugins " option to the configure script when you build Traffic Server:

   $ ./configure --enable-experimental-plugins

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The "Digest: SHA-256=..." header is also more efficient than "Link: <...>; rel=duplicate" headers because it involves a constant number of cache lookups. RFC 6249 requires a "Digest: SHA-256=..." header or "Link: <...>; rel=duplicate" headers MUST be ignored:

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Alex Rousskov pointed out a project for Squid to implement Duplicate Transfer Detection:

• http://thread.gmane.org/gmane.comp.web.squid.devel/15803
• http://thread.gmane.org/gmane.comp.web.squid.devel/16335
• http://www.hpl.hp.com/techreports/2004/HPL-2004-29.pdf

Per Jessen is working on another project for Squid with a similar goal: http://wiki.jessen.ch/index/How_to_cache_openSUSE_repositories_with_Squid