code: public void handle(String pathInContext, String pathParams, HttpRequest httpRequest, HttpResponse httpResponse)
          throws HttpException, IOException
      {
          if (!isStarted())
              return;
          try
          {
              super.handle(pathInContext, pathParams, httpRequest, httpResponse);
          }
          finally
          {
              if (!httpRequest.isHandled())
                  httpResponse.sendError(HttpResponse.__404_Not_Found);
              httpRequest.setHandled(true);
              if (!httpResponse.isCommitted())
              {
                  httpResponse.completing();
                  httpResponse.commit();
              }
          }
      }
docs: /* ------------------------------------------------------------