code: @CacheControl(policy = { CachePolicy.MUST_REVALIDATE }, maxAge = 15 * 60)
  	@RequestMapping("/directions.do")
  	public String handleProducDirectionsRequest(Model model) {
  		model.addAttribute("pageName", "Directions");
  		return "page";
  	}
docs: Directions page allowing caching for 15 minutes, but requiring
  re-revalidation before serving user a potentially stale resource.