http header Volley

httheadervolley.java

    public void requestWithSomeHttpHeaders() {
        RequestQueue queue = Volley.newRequestQueue(getActivity());
        String url = "http://mimfoundation.or.id/underground/api/api.php?donat=getDetailSantri&uid=zainal";
        StringRequest postRequest = new StringRequest(Request.Method.GET, url,
                new Response.Listener<String>()
                {
                    @Override
                    public void onResponse(String response) {
                        // response
                        Log.d("Response", response);
                        Toast.makeText(getActivity(), response.toString(), Toast.LENGTH_SHORT).show();
                    }
                },
                new Response.ErrorListener()
                {
                    @Override
                    public void onErrorResponse(VolleyError error) {
                        // TODO Auto-generated method stub
                        Log.d("ERROR", "error => " + error.toString());
                    }
                }
        ) {
            @Override
            public Map<String, String> getHeaders() throws AuthFailureError {
                Map<String, String>  params = new HashMap<String, String>();
                params.put("key", "qweasd321");

                return params;
            }
        };
        queue.add(postRequest);

    }