Can't connect to service(Spotify OAuth service)?

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WPF

C#5.0

Windows-Phone-8.1

GET https://accounts.spotify.com/authorize/?client_id=5fe01282e44241328a84e7c5cc169165&response_type=code&redirect_uri=https%3A%2F%2Fexample.com%2Fcallback&scope=user-read-private%20user-read-email&state=34fFs29kd09

 String SpotifyUrl = "https://accounts.spotify.com/authorize?client_id="+Uri.EscapeDataString("9ac2b............3")
+ "&response_type=code&redirect_uri="
 + Uri.EscapeDataString("http://localhost:8888/callback")
 +"&scope="+Uri.EscapeDataString("user-read-private user-read-email");
                Uri StartUri = new Uri(SpotifyUrl);
                Uri EndUri = new Uri("http://localhost:8888/callback");
#if WINDOWS_PHONE_APP
                WebAuthenticationBroker.AuthenticateAndContinue(StartUri, EndUri, null, WebAuthenticationOptions.None);
#else
                WebAuthenticationResult WebAuthenticationResult = await WebAuthenticationBroker.AuthenticateAsync(
                                                        WebAuthenticationOptions.None,
                                                        StartUri,
                                                        EndUri);
                if (WebAuthenticationResult.ResponseStatus == WebAuthenticationStatus.Success)
                {
                    OutputToken(WebAuthenticationResult.ResponseData.ToString());
                    await GetSpotifyUserNameAsync(WebAuthenticationResult.ResponseData.ToString());
                }

The issuse is" Can't connect to service but I was trying to connect to facebook service then it ok?
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