RFR: Initial implementation of RestRequest cache expiration

[Erik Helin]

On Fri, 25 Sep 2020 10:18:00 GMT, Robin Westberg <rwestberg at openjdk.org> wrote:

> Check the age of cached pages before reusing them to avoid incorrectly receiving stale date from misbehaving caches.
> 
> Best regards,
> Robin

Looks good!

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Marked as reviewed by ehelin (Reviewer).

PR: https://git.openjdk.java.net/skara/pull/845