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From "Jon Moore (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HTTPCLIENT-1250) Allow query string to be ignored when determining cacheability for HTTP 1.0 responses
Date Fri, 12 Oct 2012 21:37:03 GMT

    [ https://issues.apache.org/jira/browse/HTTPCLIENT-1250?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13475376#comment-13475376
] 

Jon Moore commented on HTTPCLIENT-1250:
---------------------------------------

@don: it's possible that you've exposed a bug rather than a behavior that needs to be configured
around. Section 13.9 of RFC 2616: http://www.w3.org/Protocols/rfc2616/rfc2616-sec13.html#sec13.9
is a little ambiguous for me, as your additional unit test highlights. I think the question
is: if a 1.0 origin puts explicit cacheability markers on a request (Expires, Last-Modified,
Cache-Control) with a query component, are you allowed to cache it?

Caching them is definitely at least conditionally compliant (since the HTTP/1.0 restriction
is just a SHOULD NOT), and in fact the httpbis clarification indicates the restriction isn't
widely implemented: http://tools.ietf.org/html/draft-ietf-httpbis-p6-cache-21#section-4.1.2

So I'd actually like to suggest that we modify your patch so that it caches queries with explicit
cacheability by default, and have the opt-in behavior be to turn off caching for those 1.0
queries.

Also, small point of administrivia: official patches have to get posted to JIRA; the github
version of httpclient is just a mirror of the official SVN repository right now.

Would you mind making the above change and then submitting a patch and further comments against
the JIRA issue here?

Thanks.
                
> Allow query string to be ignored when determining cacheability for HTTP 1.0 responses
> -------------------------------------------------------------------------------------
>
>                 Key: HTTPCLIENT-1250
>                 URL: https://issues.apache.org/jira/browse/HTTPCLIENT-1250
>             Project: HttpComponents HttpClient
>          Issue Type: Improvement
>          Components: Cache
>    Affects Versions: 4.2.1
>            Reporter: Don Brown
>
> For HTTP 1.0 responses, the cache uses a heuristic that checks for the presence of a
query string, and if found, disables caching regardless of any explicit cache headers.  This
should be configurable to allow a client to disable this heuristic.
> In my case, I have a squid proxy in front of my server that is turning all responses
into HTTP 1.0 responses, and thereby, disabling the cache for all outgoing requests that involve
a query string.  Ignoring the query string will work great for me as I use the cache in a
controlled environment where the caching behavior is documented and understood by clients.

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