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Return a valid 1xx warning header value describing the cache
adjustments.
The response is provided too allow warnings like 113
http://tools.ietf.org/html/rfc7234#section-5.5.4 where we need
to explicitly say response is over 24 hours old.
z110 - "Response is Stale"� ��self�responses r �warningzBaseHeuristic.warning s � � +r c � � i S )z�Update the response headers with any new headers.
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by way of the provided headers.
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Cache the response by providing an expires 1 day in the
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If there is no Expires header already, fall back on Last-Modified
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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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