docs: public static HttpServletRequest getHttpServletRequestFromExternalWebflowContext(final RequestContext context) {
          Assert.isInstanceOf(ServletExternalContext.class, context.getExternalContext(),
              "Cannot obtain HttpServletRequest from event of type: "
                  + context.getExternalContext().getClass().getName());
  
          return (HttpServletRequest) context.getExternalContext().getNativeRequest();
      }