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From "Jonathan Moore (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HTTPCLIENT-997) cache module should handle out-of-order validations properly and unconditionally refresh
Date Tue, 21 Sep 2010 14:46:33 GMT

     [ https://issues.apache.org/jira/browse/HTTPCLIENT-997?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jonathan Moore updated HTTPCLIENT-997:
--------------------------------------

    Attachment: unconditional-retry-validate.patch

The attached patch addresses this issue. In addition, there were a couple of bugs that were
fixed:

1. When we get a potentially cacheable response outside of the validation path, we likewise
MUST check for out-of-order Date headers and not replace existing entries with older-dated
ones.

2. Client requests with 'no-cache' or 'no-store' were causing invalidation of existing cache
entries, which is not actually required by the protocol.

This patch is contributed to the ASF with the permission of my employer.


> cache module should handle out-of-order validations properly and unconditionally refresh
> ----------------------------------------------------------------------------------------
>
>                 Key: HTTPCLIENT-997
>                 URL: https://issues.apache.org/jira/browse/HTTPCLIENT-997
>             Project: HttpComponents HttpClient
>          Issue Type: Improvement
>          Components: Cache
>    Affects Versions: 4.1 Alpha2
>            Reporter: Jonathan Moore
>         Attachments: unconditional-retry-validate.patch
>
>
> There is a protocol recommendation that when we attempt to revalidate a cache entry,
but we receive a response that has a Date header that's actually *older* than that of our
current entry, we SHOULD revalidate again unconditionally with either max-age=0 or no-cache
(since some upstream cache would appear to be out-of-date).
> http://www.w3.org/Protocols/rfc2616/rfc2616-sec13.html#sec13.2.6

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