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https://issues.apache.org/jira/browse/TS-4751?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15419326#comment-15419326
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James Peach commented on TS-4751:
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I was able to reproduce this by using {{header_rewrite}} to inject a bogus
{{Age}} into the server response. This ends up caching the {{Age}} header such
that it is not reset when subsequent responses do not have an {{Age}}.
> revalidation can skip updating the Age header
> ---------------------------------------------
>
> Key: TS-4751
> URL: https://issues.apache.org/jira/browse/TS-4751
> Project: Traffic Server
> Issue Type: Bug
> Components: Cache, Core
> Reporter: James Peach
>
> In {{HttpTransact::merge_and_update_headers_for_cache_update}}, the cached
> {{Age}} header is only updated if the server response also contains an
> {{Age}} header. If the revalidation response does not contain an {{Age}}, we
> will retain the cache {{Age}} header which makes the document permanently
> stale, causing a revalidation on every request.
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