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From "Jon Moore (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HTTPCLIENT-975) add support to caching module for RFC 5861 (stale-on-error and stale-while-revalidate)
Date Thu, 16 Dec 2010 11:59:04 GMT

    [ https://issues.apache.org/jira/browse/HTTPCLIENT-975?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12972054#action_12972054
] 

Jon Moore commented on HTTPCLIENT-975:
--------------------------------------

@Mishu: thanks! Patch committed. I changed the default setting of background revalidation
workers to 0 (disabling the feature by default), but only temporarily. The default fixedThreadPool
being used right now has a potentially unbounded queue length, which I think isn't safe for
a default setting. I'm planning to add CacheConfig settings for the max idle worker lifetime
and the max queue length, with sensible defaults, then re-enable the feature by default with
conservative settings.


> add support to caching module for RFC 5861 (stale-on-error and stale-while-revalidate)
> --------------------------------------------------------------------------------------
>
>                 Key: HTTPCLIENT-975
>                 URL: https://issues.apache.org/jira/browse/HTTPCLIENT-975
>             Project: HttpComponents HttpClient
>          Issue Type: New Feature
>          Components: Cache
>    Affects Versions: 4.1 Beta1
>            Reporter: Jonathan Moore
>            Assignee: Jon Moore
>             Fix For: 4.1.0
>
>         Attachments: stale-if-error.patch, stale-if-error.patch, stale-while-revalidate.patch,
stale-while-revalidate.updated.patch
>
>
> These are Cache-Control extensions that allow an origin server to specify some additional
behavior for stale cache entries. Stale-on-error configurations allow a cache to continue
serving stale content for a certain period of time if a revalidation fails, and stale-while-revalidate
similarly allows revalidation to occur asynchronously. Some reverse proxies such as Squid
can be configured to understand these headers, which means that some origin servers are probably
sending them, and that we can likewise take advantage of them.

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