gistfile1.cs

    CookieContainer cookieJar = new CookieContainer();
            HttpClientHandler handler = new HttpClientHandler
            {
                CookieContainer = cookieJar,
                AllowAutoRedirect = true
            };
            handler.UseCookies = true;
            handler.UseDefaultCredentials = false;

            
            HttpClient client = new HttpClient(handler as HttpMessageHandler);

            //cookieJar.Add(new Cookie("clientfoo", "bar2", "/", "OAK"));
            cookieJar.Add(new Uri("http://oak:9999/"), new Cookie("clientfoo", "bar2"));
            
            var response = client.GetAsync(new Uri("http://oak:9999/api/Cookie")).Result;