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        Return a valid 1xx warning header value describing the cache
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        The response is provided too allow warnings like 113
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        to explicitly say response is over 24 hours old.
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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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