Android : HttpDelete request executing

I've tried send HttpDelete response to URL guiddy.fosslabs.ru/customlessons/:id, where id is field id of my Object. But when I try get HttpEntity, it's empty. May be I execute incorrect request? There is my AsyncTask with request

class SendRemoveTask extends AsyncTask<Void, Void, String> {

    private HttpClient client;
    private HttpResponse response;
    private String url = "http://guiddy.fosslabs.ru/customlessons/:";

    public SendRemoveTask(long id) {
        url += id;
    }

    @Override
    protected String doInBackground(Void... params) {
        try {
            client = new DefaultHttpClient();
            HttpDelete del = new HttpDelete(url);
            del.setHeader("Cookie",
                    "_guidy_server_session=" + rmbToken);
            response = client.execute(del);
            HttpEntity entity = response.getEntity();
            Log.d("Entity", "entity " + EntityUtils.toString(entity));
        } catch (ClientProtocolException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return null;
    }

}