[jira] [Commented] (TS-3993) Would like a way to mark cache objects as stale

["Felicity Tarnell (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/TS-3993?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14989625#comment-14989625 ] 

Felicity Tarnell commented on TS-3993:
--------------------------------------

Two possible ways I can see to implement this: either add a new config option, like {{proxy.config.http.cache.purge_invalidates_object}}, or a new request header to trigger the refresh:

{noformat}
GET / HTTP/1.1
Host: example.com
Cache-Control: x-background-revalidate

HTTP/1.1 202 Accepted
Content-Length: 0
{noformat}

(Or possibly even both.)

> 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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