code: private void handleBackendClientResponses(final HttpRequest clientRequest,
                                                final int code,
                                                final String contentType,
                                                final byte[] body,
                                                final MultiMap<String, String> headers) {
  
          /** If it is handled like it timed out already or some other error then don't do anything. */
          if (!clientRequest.isHandled()) {
  
              /* If it was handled, let everyone know so we don't get a timeout. */
              clientRequest.handled();
  
              /* Send the response out the front end. */
              clientRequest.getReceiver().response(code, contentType, body, headers);
          }
      }
docs: Handle a response from the backend service
  
  @param clientRequest clientRequest (original client request)
  @param code          response code from the backend.
  @param contentType   contentType from the backend.
  @param body          body from the backend.
  @param headers       headers from the backend.