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How to cache openSUSE repositories with Squid is another, different example of a use case where picking a URL that's already cached is importantvaluable.

What it Does

When it sees a response with a "Location: ..." header and a "Digest: SHA-256=..." header, it checks to see if the URL in the Location header is already cached. If it isn't, then it tries to find a URL that is cached to use instead. It looks in the cache for some object that matches the digest in the Digest header and if it finds something, then it rewites the Location header with the URL from that object.

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