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https://issues.apache.org/jira/browse/HTTPCLIENT-1371?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13754842#comment-13754842
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Jon Moore commented on HTTPCLIENT-1371:
---------------------------------------

I've applied the patch to httpclient-cache, which means it should go out in the 
4.3 GA release. I haven't applied the async portion of the patch yet because I 
think we need the 4.3 GA release of the synchronous client to go out to avoid 
having SNAPSHOT dependencies (since the async patch depends on updates to 
CacheConfig). I did review the async patch, which is trivial and obviously fine.

Let me do some more investigation about what to do here; it could be that we 
just need to raise an issue on the async client to track this, which will allow 
us to close this issue, if you can re-attach your async patch there. Stay tuned.

                
> Weak ETag Validation is Useful On PUT With If-Match
> ---------------------------------------------------
>
>                 Key: HTTPCLIENT-1371
>                 URL: https://issues.apache.org/jira/browse/HTTPCLIENT-1371
>             Project: HttpComponents HttpClient
>          Issue Type: Improvement
>          Components: HttpCache
>    Affects Versions: 4.3 Beta2
>            Reporter: James Leigh
>              Labels: patch
>             Fix For: 4.4 Final
>
>         Attachments: HTTPCLIENT-1371-httpasyncclient.patch, 
> HTTPCLIENT-1371.patch
>
>
> RFC2616 explicitly prohibits the use of weak validators in non-GET requests, 
> however, the HTTPbis working group says while the limitation for weak 
> validators on ranged requests makes sense, weak ETag validation is useful on 
> full non-GET requests; e.g., PUT with If-Match. When HTTPbis working group 
> publishes a clarification to HTTP/1.1, weak validators will be allow for PUT 
> and DELETE requests. HttpClient should make this an config option until 
> HTTP/1.1 is officially clarified.
> http://trac.tools.ietf.org/wg/httpbis/trac/ticket/116

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