docs: public static void putWarnCookieIfRequestParameterPresent(final CasCookieBuilder warnCookieGenerator, final RequestContext context) {
          if (warnCookieGenerator != null) {
              LOGGER.trace("Evaluating request to determine if warning cookie should be generated");
              val response = WebUtils.getHttpServletResponseFromExternalWebflowContext(context);
              if (StringUtils.isNotBlank(context.getExternalContext().getRequestParameterMap().get("warn"))) {
                  warnCookieGenerator.addCookie(response, "true");
              }
          } else {
              LOGGER.trace("No warning cookie generator is defined");
          }
      }