Github user jpeach commented on the issue:
https://github.com/apache/trafficserver/pull/864
The problem we hit was we had a bogus Age (12000) header cached. Since the
origin was no linger sending an Age header, the object would never become fresh.
One common case could be an origin that sends Expires, then is reconfigured
to not send Expires. In this case, we would always keep the Expires from the
cached header which would be wrong.
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