code: protected void writeHeaders(HttpServletRequest request, HttpServletResponse response, List<Command> results) throws ServletException, IOException {
          // empty on purpose
      }
docs: Updates {@code response} headers if needed.
  
  @param request  - an HttpServletRequest object that contains the request the client has made of the servlet
  @param response -  an HttpServletResponse object that contains the response the servlet sends to the client
  @param results  - the list of commands to be sent to the client after the response was processed
  
  @throws IOException      - if an input or output error is detected when the servlet handles the request
  @throws ServletException - if the request for the POST could not be handled