static void validateHttpRedirect(String url, ParserContext pc, Object source) {
		if (!StringUtils.hasText(url) || UrlUtils.isValidRedirectUrl(url)
				|| url.startsWith("$") || url.startsWith("#")) {
			return;
		}
		pc.getReaderContext().warning(
				url + " is not a valid redirect URL (must start with '/' or http(s))",
				source);
	}