rest - Android Volley gives me 400 error

Question

I'm trying to make a POST request to my API and it works in Postman (I get a valid JSON object), but not using Volley. With the following code:

String URL = "http://somename/token";
RequestQueue queue = Volley.newRequestQueue(StartActivity.this);
queue.add(new JsonObjectRequest(Method.POST, URL, null,
   new Listener<JSONObject>() {
       @Override
       public void onResponse(JSONObject response) {
           // handle response
           Log.i("StartActivity", response.toString());
       }
   }, new ErrorListener() {
       @Override
       public void onErrorResponse(VolleyError error) {
           // handle error   
           Log.i("StartActivity", error.toString());
       }
   }) {

   @Override
   public Map<String, String> getHeaders() throws AuthFailureError {
       HashMap<String, String> headers = new HashMap<String, String>();
       headers.put("username", "someUsername");
       headers.put("password", "somePassword");
       headers.put("Authorization", "Basic someCodeHere");
       return headers;
   }
   @Override
    protected Map<String,String> getParams(){
        Map<String,String> params = new HashMap<String, String>();
        params.put("grant_type", "client_credentials");

            return params;
        }
   });

I get the following error:

02-12 21:42:54.774: E/Volley(19215): [46574] BasicNetwork.performRequest: Unexpected response code 400 for http://somename/token/

I have seen a lot of examples and I don't really see what is going wrong here. Anyone any idea?

I updated the code with this method:

HashMap<String, String> createBasicAuthHeader(String username, String password) {
        HashMap<String, String> headerMap = new HashMap<String, String>();

        String credentials = username + ":" + password;
        String base64EncodedCredentials =
                Base64.encodeToString(credentials.getBytes(), Base64.NO_WRAP);
        headerMap.put("Authorization", "Basic " + base64EncodedCredentials);

        return headerMap;
    }

and changed getHeaders() to:

@Override
   public Map<String, String> getHeaders() throws AuthFailureError {
       return createBasicAuthHeader("username", "password");
   }

Still getting the same error!

Answer 1

I had the same problem and i removed from the header:

  headers.put("Content-Type", "application/json");

now it works great!