Github user wbardwel commented on the issue:
https://github.com/apache/trafficserver/pull/749
I assumed that the Cache-Control: no-store stuff was because that function
is not mostly used for 304s...it is mostly used for 5xx errors, it might need
to branch to handle different status codes differently.
build_response() seems to no try to pass along Last-Modified headers, only
ETag which seems slightly wrong...(but doesn't have the other issues that this
is about)
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