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https://issues.apache.org/jira/browse/HTTPCLIENT-975?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12973000#action_12973000
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Jon Moore commented on HTTPCLIENT-975:
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I think I found a bug in the current implementation: I think
stale-while-revalidate probably needs to be subject to the same rules as those
we apply when a revalidation fails due to an IOException. Namely,
stale-while-revalidate probably needs to yield to must-revalidate (it is
possible, although strange, for both directives to appear) and
proxy-revalidate, and should probably also not asynchronously validate if the
request has an explicit freshness requirement (max-stale for example).
Also, I am finding that the main execute() method in CachingHttpClient is in
serious need of refactoring -- it is really getting far too long, so I'm going
to start by cleaning up there.
> 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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