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https://issues.apache.org/jira/browse/TS-3993?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15424757#comment-15424757
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Alan M. Carroll commented on TS-3993:
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I think what I would like to do is provide an API to control the expiration
time for the object.
> Would like a way to mark cache objects as stale
> -----------------------------------------------
>
> Key: TS-3993
> URL: https://issues.apache.org/jira/browse/TS-3993
> Project: Traffic Server
> Issue Type: Improvement
> Components: Cache
> Reporter: Felicity Tarnell
> Fix For: sometime
>
>
> We use {{stale-if-error}} to return cached content to clients in case of
> origin server failure. However, if an object is removed from the cache by a
> PURGE request, and the origin fails before another client requests the same
> object, an error will be served.
> Instead of using PURGE, we'd like a way to mark the cache item as stale, but
> not delete it, so it will be revalidated on the next request, and if the
> origin is unavailable, it can be served by {{stale-if-error}}.
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