HttpClient digest authentication does not work if the uri has querystring parameters

I am using Visual Studion 2010 and I installed 'MS .NET 4 HTTP Client Libraries', version 2.0.20710.0, via Nuget.

I supply digest credentials (in a credentials cache) to a new HttpClientHandler, and then create a new HttpClient with that handler.

I then call GetAsync on the HttpClient. If the URI has no querystring parameters, then every thing works OK. However if there ARE querystring parameters then I get a 401 (unauthorised) HTTP status.

Has anyone else had this problem and found a solution?