Github user jpeach commented on the issue:
https://github.com/apache/trafficserver/pull/864
I guess the key phrase from RFC 2616 is ``if the field-value might differ
from that sent in any previous response``. What happens if the origin had an
``Expires`` but not it doesn't? RFC7232 would say that we MUST not use the
``Expires`` we have, but RFC2616 says we should. I think this could easily
happen with an origin server configuration change.
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