Is there any way to set the headers when making a synchronous Volley call?

Question

Is there any way to set the headers when making a synchronous Volley call? Here is my code:

    RequestFuture<JSONObject> future = RequestFuture.newFuture();

    JsonObjectRequest request = new JsonObjectRequest(Request.Method.POST, localUri, postData, future, future);

    VolleySingleton.getmInstance(context).addToRequestQueue(request);

    JSONObject response = future.get();

I see how to do it with a listener, but not

    JsonObjectRequest request = new JsonObjectRequest(Request.Method.POST, localUri, postData, new Response.Listener<JSONObject>() {
        @Override
        public void onResponse(JSONObject response) {
            Log.d(TAG, "onResponse: ");

        }
    }, new Response.ErrorListener() {
        @Override
        public void onErrorResponse(VolleyError error) {
            Log.d(TAG, "post.onErrorResponse: " + error.getMessage() );
        }

    }) {
        //here is where we pass the access tokens
        @Override
        public Map<String, String> getHeaders() throws AuthFailureError {
            return getGlobalHeaders();
        }

        @Override
        public String getBodyContentType() {
            Log.d(TAG, "getBodyContentType: " + super.getBodyContentType());
            return "application/json";
        }
    };