On Thu, 2014-01-16 at 13:21 -0700, Dennis Heimbigner wrote:
> As I understand it, in httpclient 4,
> each credentials provider is solely responsible
> for caching of credentials.
> 

Actually it is AuthCache [1]. 

> The question I have is: when authentication
> fails using a set of credentials provided
> by a credentials provider (say because they are out of date),
> how is the credentials provider notified that those credentials
> should be purged from the cache?
> 

This is done by the default AuthenticationStrategy implementations [2].

Hope this helps

Oleg

[1]
http://hc.apache.org/httpcomponents-client-4.3.x/httpclient/xref/org/apache/http/client/AuthCache.html
[2]
http://hc.apache.org/httpcomponents-client-4.3.x/httpclient/xref/org/apache/http/impl/client/AuthenticationStrategyImpl.html#229



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