[SOLVED] Android Studio : Firebase Cloud Messaging Unexpected response code 401

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I would like to send a notification from a device to the other device but it keep on displaying the error message AuthFailureError. Is anyone know why how to solve this problem?

Error Message E/Volley: [18672] NetworkUtility.shouldRetryException: Unexpected response code 401 for https://fcm.googleapis.com/fcm/send

E/Volley: [18672] NetworkUtility.shouldRetryException: Unexpected response code 401 for https://fcm.googleapis.com/fcm/send

E/Result: com.android.volley.AuthFailureError

public static void SendNotifications(Context applicationContext, String targetToken, String title, String body) {
    StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
    RequestQueue queue = Volley.newRequestQueue(applicationContext);
    try {
        JSONObject json = new JSONObject();
        json.put("to", targetToken);
        JSONObject notification = new JSONObject();
        notification.put("title", title);
        notification.put("body", body);
        json.put("notification", notification);
        JsonObjectRequest jsonObjectRequest = new JsonObjectRequest(Request.Method.POST, postUrl, json, new Response.Listener<JSONObject>() {
            public void onResponse(JSONObject response) {
                Log.e("Result", String.valueOf(response));
        }, new Response.ErrorListener() {
            public void onErrorResponse(VolleyError error) {
                Log.e("Result", String.valueOf(error));
        }) {
            public Map<String, String> getHeaders() throws AuthFailureError {
                Map<String, String> header = new HashMap<>();
                header.put("Content-type", "application/json");
                header.put("authorization", "key=" + fcmServerKey);
                return header;

    } catch (JSONException jsonException) {



because your write

header.put("Content-type", "application/json");header.put("authorization", "key=" + fcmServerKey);

Modify it to be

header.put("Content-Type", "application/json");header.put("Authorization", "key=" + fcmServerKey);

Content-Type not Content-type and Authorization not authorization

Answered By – Abanoob Samy

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