Felicity Tarnell created TS-3993:
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             Summary: 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


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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