使用Vaadin Flow时如何获取Springs默认白标错误页

@Route(value = "error", layout = MainLayout.class)
public class CustomErrorView extends Div implements ErrorView {
    @Override
    public int setErrorParameter(BeforeEnterEvent event, ErrorParameter<Exception> parameter) {
        // 在这里获取Spring的默认白标错误页
        HttpServletRequest request = VaadinServletRequest.getCurrent().getHttpServletRequest();
        Integer statusCode = (Integer) request.getAttribute(RequestDispatcher.ERROR_STATUS_CODE);
        String errorMessage = (String) request.getAttribute(RequestDispatcher.ERROR_MESSAGE);
        // 处理错误信息，例如显示在自定义错误视图中
        setText("Error " + statusCode + ": " + errorMessage);
        return HttpServletResponse.SC_OK;
    }
}