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From "Jonathan Moore (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HTTPCLIENT-982) Could we get a way to know if the response has been served from the cache or not ?
Date Wed, 25 Aug 2010 14:36:18 GMT

    [ https://issues.apache.org/jira/browse/HTTPCLIENT-982?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12902463#action_12902463
] 

Jonathan Moore commented on HTTPCLIENT-982:
-------------------------------------------

Ok, I am working on a patch for this, and would like to solicit some opinions. Current enum
has:

CACHE_MODULE_RESPONSE : if the response was generated directly by the caching module itself
(neither pulled from the cache nor taken from an upstream response)
CACHE_HIT : response generated from cache with no upstream request
CACHE_MISS : response came from upstream request
VALIDATED : response generated from cache after upstream validation

In the case where a cache entry is stale, and validation fails due to an IOException, the
CachingHttpClient currently either:
(a) generates a 502 (Gateway Timeout) for must-revalidate and proxy-revalidate responses.
I'm guessing this should be CACHE_MODULE_RESPONSE.
(b) generates a stale cache entry and attaches a Warning header. Should this be CACHE_HIT?

Or do we need new enum values to cover these cases?


> Could we get a way to know if the response has been served from the cache or not ?
> ----------------------------------------------------------------------------------
>
>                 Key: HTTPCLIENT-982
>                 URL: https://issues.apache.org/jira/browse/HTTPCLIENT-982
>             Project: HttpComponents HttpClient
>          Issue Type: New Feature
>          Components: Cache
>    Affects Versions: 4.1 Alpha2
>            Reporter: Vianney Carel
>            Priority: Trivial
>
> Is there a way to know if the response has been served from the cache or not ?
> That's an information which might be useful for monitoring the activity of the cache.
> If there's no current way, maybe a flag could be added in the request context whenever
the response comes from the cache ... ?

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