code: protected void setupPushedActionForm(HtmlResponse response) {
          response.getPushedFormInfo().ifPresent(formInfo -> {
              final String formKey = LastaWebKey.PUSHED_ACTION_FORM_KEY;
              VirtualForm form = createPushedActionForm(formInfo, formKey);
              runtime.manageActionForm(OptionalThing.of(form)); // to export properties to request attribute
              requestManager.setAttribute(formKey, form);
          });
      }
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