Test to verify the problem reported on [Stack Overflow](http://stackoverflow.com/questions/29118669/client-digest-authentication-with-poco)

PocoHTTPDigestAuthentication.cpp

#include <Poco/Net/HTTPRequest.h>
#include <Poco/Net/HTTPResponse.h>
#include <Poco/Net/HTTPClientSession.h>
#include <Poco/StreamCopier.h>
#include <Poco/Net/HTTPCredentials.h>
#include <sstream>

using namespace Poco::Net;

int main()
{
	HTTPClientSession session("httpbin.org");

	HTTPRequest request(
		"GET",
		// "http://httpbin.org/basic-auth/user/passwd", // basic
		"http://httpbin.org/digest-auth/auth/user/passwd",  // digest
		HTTPMessage::HTTP_1_1);
	session.sendRequest(request);

	HTTPResponse response;
	session.receiveResponse(response);

	poco_assert(HTTPResponse::HTTP_UNAUTHORIZED == response.getStatus());

	HTTPCredentials creds("user", "passwd");
	std::cout << response.get("WWW-Authenticate") << std::endl;
	creds.authenticate(request, response);
	std::cout << std::endl << request.get("Authorization") << std::endl;
	session.sendRequest(request);

	response.clear();
	std::istream& bodyStream = session.receiveResponse(response);
	poco_assert(HTTPResponse::HTTP_UNAUTHORIZED != response.getStatus());
	poco_assert(HTTPResponse::HTTP_OK == response.getStatus());

	std::ostringstream strStream;
	Poco::StreamCopier::copyStream(bodyStream, strStream);
	poco_assert("" != strStream.str());
}