wcf xml消息客户端cookie

public override bool Login(string userName, string password)
        {

            using (HttpClient client = new HttpClient(URI))
            {
                StringBuilder sb = new StringBuilder();
                sb.Append("Login");

                Uri uri = new Uri(URI + sb.ToString());
                Login lg = new Login();
                lg.userName = userName;
                lg.password = password;
                HttpContent content = HttpContentExtensions.CreateXmlSerializable<Login>(lg, null);

                StringBuilder conntentStr = new StringBuilder();
                //string s = content.ReadAsString();
                using (HttpRequestMessage request = new HttpRequestMessage("POST", uri, content))
                {
                    request.Headers.Accept.AddString(accepts);
                    using (HttpResponseMessage response = client.Send(request))
                    {
                        Microsoft.Http.Headers.Cookie cook=null;
                        if(response.Headers.SetCookie!=null && response.Headers.SetCookie.Count>0)
                        {
                            cook= response.Headers.SetCookie[0];
                            CookieMe.SaveCookie(cook["YourAuth"]);
                        }                      
                        Stream result = response.Content.ReadAsStream();
                        XmlSerializer ser = new XmlSerializer(typeof(LoginResponse));//将对象序列化到xml文档
                        LoginResponse lr = (LoginResponse)ser.Deserialize(result);
                        return lr.LoginResult;
                    }
                }
                
            }
        }