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Return a valid 1xx warning header value describing the cache
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adjustments.
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http://tools.ietf.org/html/rfc7234#section-5.5.4 where we need
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to explicitly say response is over 24 hours old.
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r r7 c ó( e Zd ZdZddZddZddZy) Ú ExpiresAfterz;
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If there is no Expires header already, fall back on Last-Modified
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using the heuristic from
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http://tools.ietf.org/html/rfc7234#section-4.2.2
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to calculate a reasonable value.
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Firefox also does something like this per
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https://developer.mozilla.org/en-US/docs/Web/HTTP/Caching_FAQ
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http://lxr.mozilla.org/mozilla-release/source/netwerk/protocol/http/nsHttpResponseHead.cpp#397
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Unlike mozilla we limit this to 24-hr.
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