public async Task StoresCredentialForKeyAndGitKey()
        {
            using (var credentialCache = new CredentialCache())
            {
                try
                {
                    var credential = Tuple.Create("somebody", "somebody's secret");

                    await credentialCache.InsertObject(nameof(StoresCredentialForKeyAndGitKey), credential);

                    var retrieved = await credentialCache.GetObject<Tuple<string, string>>(nameof(StoresCredentialForKeyAndGitKey));
                    Assert.Equal("somebody", retrieved.Item1);
                    Assert.Equal("somebody's secret", retrieved.Item2);
                    var retrieved2 = await credentialCache.GetObject<Tuple<string, string>>("git:" + nameof(StoresCredentialForKeyAndGitKey));
                    Assert.Equal("somebody", retrieved2.Item1);
                    Assert.Equal("somebody's secret", retrieved2.Item2);
                }
                finally
                {
                    try
                    {
                        await credentialCache.Invalidate(nameof(StoresCredentialForKeyAndGitKey));
                    }
                    catch (Exception)
                    {
                    }
                }
            }
        }

        public async Task RetrievesValueWithAlternateKeys()
        {
            const string key = nameof(RetrievesValueWithAlternateKeys);
            using (var credentialCache = new CredentialCache())
            {
                try
                {
                    var credential = Tuple.Create("somebody", "somebody's secret");
                    await credentialCache.InsertObject(key, credential);

                    var retrieved = await credentialCache.GetObject<Tuple<string, string>>(key);

                    Assert.Equal("somebody", retrieved.Item1);
                    Assert.Equal("somebody's secret", retrieved.Item2);

                    var retrieved2 = await credentialCache.GetObject<Tuple<string, string>>("git:" + key + "/");

                    Assert.Equal("somebody", retrieved2.Item1);
                    Assert.Equal("somebody's secret", retrieved2.Item2);

                    var retrieved3 = await credentialCache.GetObject<Tuple<string, string>>("login:" + key + "/");

                    Assert.Equal("somebody", retrieved3.Item1);
                    Assert.Equal("somebody's secret", retrieved3.Item2);
                }
                finally
                {
                    await credentialCache.Invalidate(key);
                }
            }
        }

 /// <summary>
 /// Instantiates a new OneDriveClient.
 /// </summary>
 public OneDriveClient(
     AppConfig appConfig,
     CredentialCache credentialCache = null,
     IHttpProvider httpProvider = null,
     IServiceInfoProvider serviceInfoProvider = null)
     : base(appConfig, credentialCache, httpProvider, serviceInfoProvider)
 {
 }

 public async Task ThrowsObservableInvalidOperationExceptionWhenRetrievingSomethingNotATuple()
 {
     using (var credentialCache = new CredentialCache())
     {
         await Assert.ThrowsAsync<InvalidOperationException>(
             async () => await credentialCache.GetObject<string>("_"));
     }
 }

 /// <summary>
 /// Instantiates a new OneDriveClient.
 /// </summary>
 public OneDriveClient(
     AppConfig appConfig,
     CredentialCache credentialCache = null,
     IHttpProvider httpProvider = null,
     IServiceInfoProvider serviceInfoProvider = null,
     ClientType clientType = ClientType.Consumer)
     : base(appConfig, credentialCache, httpProvider, serviceInfoProvider, clientType)
 {
 }

 private static CredentialCache GetCredential()
 {
     string url = @"http://github.com/api/v3/users";
     //ServicePointManager.SecurityProtocol = SecurityProtocolType.Ssl3;
     CredentialCache credentialCache = new CredentialCache();
     //credentialCache.Add(new System.Uri(url), "Basic", new NetworkCredential(ConfigurationManager.AppSettings["gitHubUser"], ConfigurationManager.AppSettings["gitHubUserPassword"]));
     credentialCache.Add(new System.Uri(url), "Basic", new NetworkCredential("huj", "Savit5ch"));
     return credentialCache;
 }

 public async Task ThrowsObjectDisposedExceptionWhenDisposed()
 {
     using (var credentialCache = new CredentialCache())
     {
         credentialCache.Dispose();
         await Assert.ThrowsAsync<ObjectDisposedException>(
             async () => await credentialCache.GetObject<Tuple<string, string>>("_"));
     }
 }

        private static CredentialCache UriAuthenticationTypeCredentialCache()
        {
            CredentialCache cc = new CredentialCache();

            cc.Add(uriPrefix1, authenticationType1, credential1);
            cc.Add(uriPrefix1, authenticationType2, credential2);

            cc.Add(uriPrefix2, authenticationType1, credential3);
            cc.Add(uriPrefix2, authenticationType2, credential4);

            return cc;
        }

        private static CredentialCacheCount CreateUriCredentialCacheCount(CredentialCache cc = null, int count = 0)
        {
            cc = cc ?? new CredentialCache();

            cc.Add(uriPrefix1, authenticationType1, credential1); count++;
            cc.Add(uriPrefix1, authenticationType2, credential2); count++;

            cc.Add(uriPrefix2, authenticationType1, credential3); count++;
            cc.Add(uriPrefix2, authenticationType2, credential4); count++;

            return new CredentialCacheCount(cc, count);
        }

        public void TestRoundTrip()
        {
            var credentials = new CredentialCache { Logon = "user", Password = "password", AccessToken = string.Empty };
            var cache = credentials.ToString();
            Assert.That(cache, Is.Not.Null);
            Assert.That(cache, Does.Contain("user"));
            Assert.That(cache, Does.Not.Contain("password"));

            var parsed = CredentialCache.FromString(cache);
            Assert.That(parsed, Is.Not.Null);
            Assert.That(parsed.Logon, Is.EqualTo("user"));
            Assert.That(parsed.Password, Is.EqualTo("password"));
            Assert.That(parsed.AccessToken, Is.EqualTo(string.Empty));
        }

        public Task<ServiceInfo> GetServiceInfo(AppConfig appConfig, CredentialCache credentialCache, IHttpProvider httpProvider)
        {
            var microsoftAccountServiceInfo = new MicrosoftAccountServiceInfo
            {
                AppId = appConfig.MicrosoftAccountAppId,
                ClientSecret = appConfig.MicrosoftAccountClientSecret,
                CredentialCache = credentialCache,
                HttpProvider = httpProvider,
                Scopes = appConfig.MicrosoftAccountScopes,
            };

            microsoftAccountServiceInfo.AuthenticationProvider = this.AuthenticationProvider ?? new OnlineIdAuthenticationProvider(microsoftAccountServiceInfo);
            return Task.FromResult<ServiceInfo>(microsoftAccountServiceInfo);
        }

        public Task<ServiceInfo> GetServiceInfo(AppConfig appConfig, CredentialCache credentialCache, IHttpProvider httpProvider)
        {
            var microsoftAccountServiceInfo = new MicrosoftAccountServiceInfo
            {
                AppId = appConfig.MicrosoftAccountAppId,
                ClientSecret = appConfig.MicrosoftAccountClientSecret,
                CredentialCache = credentialCache,
                HttpProvider = httpProvider,
                ReturnUrl = WebAuthenticationBroker.GetCurrentApplicationCallbackUri().ToString(),
                Scopes = appConfig.MicrosoftAccountScopes,
                WebAuthenticationUi = this.webAuthenticationUi,
            };

            microsoftAccountServiceInfo.AuthenticationProvider = this.AuthenticationProvider ?? new WebAuthenticationBrokerAuthenticationProvider(microsoftAccountServiceInfo);
            return Task.FromResult<ServiceInfo>(microsoftAccountServiceInfo);
        }

        private static CredentialCacheCount CreateHostPortCredentialCacheCount(CredentialCache cc = null, int count = 0)
        {
            cc = cc ?? new CredentialCache();

            cc.Add(host1, port1, authenticationType1, credential1); count++;
            cc.Add(host1, port1, authenticationType2, credential2); count++;
            cc.Add(host1, port2, authenticationType1, credential3); count++;
            cc.Add(host1, port2, authenticationType2, credential4); count++;

            cc.Add(host2, port1, authenticationType1, credential5); count++;
            cc.Add(host2, port1, authenticationType2, credential6); count++;
            cc.Add(host2, port2, authenticationType1, credential7); count++;
            cc.Add(host2, port2, authenticationType2, credential8); count++;

            return new CredentialCacheCount(cc, count);
        }

        private static CredentialCache HostPortAuthenticationTypeCredentialCache()
        {
            CredentialCache cc = new CredentialCache();

            cc.Add(host1, port1, authenticationType1, credential1);
            cc.Add(host1, port1, authenticationType2, credential2);
            cc.Add(host1, port2, authenticationType1, credential3);
            cc.Add(host1, port2, authenticationType2, credential4);

            cc.Add(host2, port1, authenticationType1, credential5);
            cc.Add(host2, port1, authenticationType2, credential6);
            cc.Add(host2, port2, authenticationType1, credential7);
            cc.Add(host2, port2, authenticationType2, credential8);

            return cc;
        }

 /// <summary>
 /// Creates a OneDrive client for use against OneDrive consumer.
 /// </summary>
 /// <param name="appId">The application ID for Microsoft Account authentication.</param>
 /// <param name="returnUrl">The application return URL for Microsoft Account authentication.</param>
 /// <param name="scopes">The requested scopes for Microsoft Account authentication.</param>
 /// <param name="credentialCache">The cache instance for storing user credentials.</param>
 /// <param name="httpProvider">The <see cref="IHttpProvider"/> for sending HTTP requests.</param>
 /// <param name="webAuthenticationUi">The <see cref="IWebAuthenticationUi"/> for displaying authentication UI to the user.</param>
 /// <returns>The <see cref="IOneDriveClient"/> for the session.</returns>
 public static IOneDriveClient GetMicrosoftAccountClient(
     string appId,
     string returnUrl,
     string[] scopes,
     CredentialCache credentialCache = null,
     IHttpProvider httpProvider = null,
     IWebAuthenticationUi webAuthenticationUi = null)
 {
     return OneDriveClient.GetMicrosoftAccountClient(
         appId,
         returnUrl,
         scopes,
         /* clientSecret */ null,
         credentialCache,
         httpProvider,
         new ServiceInfoProvider(webAuthenticationUi));
 }

    /// <summary>
    /// 发送t_news到微博
    /// </summary>
    /// <param name="source">app key</param>
    /// <param name="username">用户名</param>
    /// <param name="password">密码</param>
    /// <param name="t_news">需要发送的微博内容</param>
    /// <param name="conn">数据库连接</param>
    public static void RequestWeibo(string source, string username, string password, string t_news, MySqlConnection conn)
    {
        string data = "source=" + source + "&status=" + HttpUtility.UrlEncode(t_news);

        //准备用户验证数据
        string usernamePassword = username + ":" + password;

        //准备调用的URL及需要POST的数据
        string url = "https://api.weibo.com/2/statuses/update.json";

        //准备用于发起请求的HttpWebRequest对象
        HttpWebRequest httpRequest = (HttpWebRequest)WebRequest.Create(url);

        //准备用于用户验证的凭据
        CredentialCache myCache = new CredentialCache();
        myCache.Add(new Uri(url), "Basic", new NetworkCredential(username, password));
        httpRequest.Credentials = myCache;
        httpRequest.Headers.Add("Authorization", "Basic " + Convert.ToBase64String(new ASCIIEncoding().GetBytes(usernamePassword)));

        //发起POST请求
        httpRequest.Method = "POST";
        httpRequest.ContentType = "application/x-www-form-urlencoded";
        Encoding encoding = Encoding.ASCII;
        byte[] bytesToPost = encoding.GetBytes(data);
        httpRequest.ContentLength = bytesToPost.Length;
        Stream requestStream = httpRequest.GetRequestStream();
        requestStream.Write(bytesToPost, 0, bytesToPost.Length);
        requestStream.Close();

        //获取服务端的响应内容
        try
        {
            WebResponse wr = httpRequest.GetResponse();
            Stream receiveStream = wr.GetResponseStream();
            StreamReader reader = new StreamReader(receiveStream, Encoding.UTF8);
            receiveStream.Close();
        }
        catch (Exception e)
        {
            conn.Open();
            MySqlCommand cmd2 = new MySqlCommand("insert into test(msg, date) values ('" + e.ToString() + "','" + DateTime.Now.ToString() + "')", conn);
            cmd2.ExecuteNonQuery();
            conn.Close();
        }
    }

        private static CredentialCache CreateCredentialCache(int uriCount, int hostPortCount)
        {
            var cc = new CredentialCache();

            for (int i = 0; i < uriCount; i++)
            {
                Uri uri = new Uri(UriPrefix + i.ToString());
                cc.Add(uri, AuthenticationType, s_credential);
            }

            for (int i = 0; i < hostPortCount; i++)
            {
                string host = HostPrefix + i.ToString();
                cc.Add(host, Port, AuthenticationType, s_credential);
            }

            return cc;
        }

            /// <summary>
            /// This method creates secure/non secure web
            /// request based on the parameters passed.
            /// </summary>
            /// <param name="uri"></param>
            /// <param name="collHeader">This parameter of type
            ///    NameValueCollection may contain any extra header
            ///    elements to be included in this request      </param>
            /// <param name="RequestMethod">Value can POST OR GET</param>
            /// <param name="NwCred">In case of secure request this would be true</param>
            /// <returns></returns>
            public virtual HttpWebRequest CreateWebRequest(string uri,
              NameValueCollection collHeader,
              string RequestMethod, bool NwCred)
            {
                HttpWebRequest webrequest =
                 (HttpWebRequest)WebRequest.Create(uri);
                webrequest.KeepAlive = false;
                webrequest.Method = RequestMethod;

                int iCount = collHeader.Count;
                string key;
                string keyvalue;

                for (int i = 0; i < iCount; i++)
                {
                    key = collHeader.Keys[i];
                    keyvalue = collHeader[i];
                    webrequest.Headers.Add(key, keyvalue);
                }

                webrequest.ContentType = "text/html";
                //"application/x-www-form-urlencoded";

                if (ProxyServer.Length > 0)
                {
                    webrequest.Proxy = new
                     WebProxy(ProxyServer, ProxyPort);
                }
                webrequest.AllowAutoRedirect = false;

                if (NwCred)
                {
                    CredentialCache wrCache =
                            new CredentialCache();
                    wrCache.Add(new Uri(uri), "Basic",
                      new NetworkCredential(UserName, UserPwd));
                    webrequest.Credentials = wrCache;
                }
                //Remove collection elements
                collHeader.Clear();
                return webrequest;
            }//End of secure CreateWebRequest

    public static void DoCredentialTest(string url)
    {
        var credential = new NetworkCredential();
        credential.UserName = "skapila";
        credential.Password =  "blah" ;
        var clientHandler = new HttpClientHandler();
        var cc = new CredentialCache();
        cc.Add(new Uri("http://httpbin.org"), "Basic", credential);

        clientHandler.Credentials = cc;
        clientHandler.PreAuthenticate = true;
        var httpClient = new HttpClient(clientHandler);

        httpClient.MaxResponseContentBufferSize = 256000;
        httpClient.DefaultRequestHeaders.Add("user-agent", "Mozilla/5.0 (compatible; MSIE 10.0; Windows NT 6.2; WOW64; Trident/6.0)");

        try{
        var responseTask = httpClient.GetAsync(url);
        responseTask.Wait();
            HttpResponseMessage response = responseTask.Result;
        //    response.EnsureSuccessStatusCode();

        if(response.Content != null) {
        var readTask = response.Content.ReadAsStreamAsync();
        readTask.Wait();
        Console.WriteLine(readTask.Result);
        }
        else
        {
        Console.WriteLine(response.StatusCode + " " + response.ReasonPhrase + Environment.NewLine);
        }

        }
        catch(Exception e)
        {
            Console.WriteLine(e);
            return ;
        }

        return;
    }

 public async Task ThrowsKeyNotFoundExceptionWhenKeyNotFound()
 {
     using (var credentialCache = new CredentialCache())
     {
         await Assert.ThrowsAsync<KeyNotFoundException>(
             async () => await credentialCache.InvalidateObject<Tuple<string, string>>("git:_"));
         await Assert.ThrowsAsync<KeyNotFoundException>(
             async () => await credentialCache.InvalidateObject<Tuple<string, string>>("_"));
     }
 }