I tried to do Digest authentication with the CachingHttpClient against an IIS 7 Webserver, but the client enters an infinite loop because the server always responds with the parameter "stale=true" in the WWW-Authenticate header. I did some debugging and found out, that the cause is the Via header added by the CachingHttpClient. So now I can also reproduce it with the not caching HttpClient when I simply add the Via header to the request.
Is this behaviour conforming to any standards, a bug in IIS 7 or a bug in the CachingHttpClient? I'm using httpclient-4.5.1
