code: public boolean isForwardToHtml() {
          if (!isHtmlResponse()) { // e.g. exception, AJAX
              return false;
          }
          final HtmlResponse htmlResponse = ((HtmlResponse) actionResponse);
          return !htmlResponse.isRedirectTo() && isHtmlTemplateResponse(htmlResponse);
      }
docs: Is the result of the action execute, forward to HTML template?
  @return The determination, true or false.