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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 Mon, 20 Dec 2010 15:06:01 GMT

    [ https://issues.apache.org/jira/browse/HTTPCLIENT-975?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12973220#action_12973220
] 

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

Upon re-reading the section of RFC2616 about cache control extensions:
http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.9.6

It does seem like the MAY of stale-if-error and stale-while-revalidate should yield to the
MUSTs of must-revalidate and proxy-revalidate and the SHOULD NOT of returning a stale response
if the client's request includes explicit freshness contraints. I've also reached out to Mark
Nottingham, the author of RFC5861, to validate this understanding.

In the meantime, I'll update the behavior here.

> 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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