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Return a valid 1xx warning header value describing the cache
adjustments.
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http://tools.ietf.org/html/rfc7234#section-5.5.4 where we need
to explicitly say response is over 24 hours old.
s 110 - "Response is Stale"( ( t selft response( ( s� /builddir/build/BUILDROOT/alt-python27-pip-20.2.4-5.el8.x86_64/opt/alt/python27/lib/python2.7/site-packages/pip/_vendor/cachecontrol/heuristics.pyt warning s c C s i S( s� Update the response headers with any new headers.
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Cache the response by providing an expires 1 day in the
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Cache **all** requests for a defined time period.
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If there is no Expires header already, fall back on Last-Modified
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to calculate a reasonable value.
Firefox also does something like this per
https://developer.mozilla.org/en-US/docs/Web/HTTP/Caching_FAQ
http://lxr.mozilla.org/mozilla-release/source/netwerk/protocol/http/nsHttpResponseHead.cpp#397
Unlike mozilla we limit this to 24-hr.
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