Custom header in HTTP Request with Volley

CustomHttpHeader.java

public void requestWithSomeHttpHeaders() {
    RequestQueue queue = Volley.newRequestQueue(this);
    String url = "http://www.somewebsite.com";
    StringRequest postRequest = new StringRequest(Request.Method.GET, url, 
        new Response.Listener<String>() 
        {
            @Override
            public void onResponse(String response) {
                // response
                Log.d("Response", response);
            }
        }, 
        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("User-Agent", "Nintendo Gameboy");  
                params.put("Accept-Language", "fr");

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

}