Calling Google OAuth 2.0 with all the parameters , it gives invalid request saying response_type is

[Bhuvin Thakker]

Guyz i have implemented a Android push notification service using Asp.net Mvc 3, Google C2DM with OAuth 2.0. 
At the point of time of implementation it was working fine. Now after starting the testing , Suddenly from yesterday i have been getting invalid_request error saying response_type parameter is missing. 

• I have checked the code it gives all the required parameters .
• I have checked the Request using fiddler it also shows the response_type = code is a post parameter.
• The google account required is also signed in.

I am not able to understand how to tackle this issue 
Code: 

public string GetAuthenticationCode()
        {
            string returnUrl = "";
            string URL = " https://accounts.google.com/o/oauth2/auth";
            NameValueCollection postFieldNameValue = new NameValueCollection();
            postFieldNameValue.Add("response_type", "code");
            postFieldNameValue.Add("client_id", "xxxxxxxxxxx.apps.googleusercontent.com");
            postFieldNameValue.Add("redirect_uri", "http://localhost:49882/TestServer/test");
            postFieldNameValue.Add("scope", "https://android.apis.google.com/c2dm/send");
            postFieldNameValue.Add("state", "profile");
            postFieldNameValue.Add("access_type", "offline");
            postFieldNameValue.Add("approval_prompt", "force");    
        //Had a doubt the request is cached so added this for the same.
            postFieldNameValue.Add("additional_param", DateTime.Now.Ticks.ToString());
            string postData = GetPostStringFrom(postFieldNameValue);
            byte[] byteArray = Encoding.UTF8.GetBytes(postData);

            HttpWebRequest Request = (HttpWebRequest)WebRequest.Create(URL);
            Request.Method = "POST";
            Request.KeepAlive = false;

            Request.ContentType = "application/x-www-form-urlencoded;charset=UTF-8";
            Request.ContentLength = byteArray.Length;


            Stream dataStream = Request.GetRequestStream();
            // Write the data to the request stream.
            dataStream.Write(byteArray, 0, byteArray.Length);
            // Close the Stream object.
            dataStream.Close();

            try
            {
                ServicePointManager.ServerCertificateValidationCallback = new System.Net.Security.RemoteCertificateValidationCallback(AcceptAllCertifications);
                WebResponse Response = Request.GetResponse();

                var sr = new StreamReader(Response.GetResponseStream());

               // Debug.WriteLine(sr.ReadToEnd());
               // returnUrl = sr.ReadToEnd();
                returnUrl = Response.ResponseUri.ToString();
            }
            catch(WebException wex)
            {
                var sr = new StreamReader(wex.Response.GetResponseStream());
                Debug.WriteLine(sr.ReadToEnd());
                throw;
            }
            return returnUrl;
        }

Other thing is I also tried to make a request after removing the response_type parameter but in that case it will throw Web Exception - Bad request.

access_type : auto is also not working.

I tried to get the content of the response stream and returned as content , it shows google sign in page . If we give the authentication details in there manually it will work . So i am stuck to implement the same . Please help.

[Breno de Medeiros]

Please supply the request and response headers in your app's communication with Google. Remember to anonymize sensitive fields, such as cookie values and client_secret (if applicable).

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--Breno

[Bhuvin Thakker]

@Breno :

The request params are : 

  Param = "response_type",value= "code"
  Param = "client_id",value =  "xxxxxxxxxxx.apps.googleusercontent.com"
  Param = "redirect_uri",value = "http://localhost:49882/TestServer/test"
  Param = "scope",value = "https://android.apis.google.com/c2dm/send"
  Param = "state",value = "profile"
  Param = "access_type",value = "offline"
  Param = "approval_prompt",value = "force"

Response Has the Uri as above.

And the Response content is a google login page .