code: public static void setNoClientCache(HttpHeaders headers) {
          // http://sockjs.github.com/sockjs-protocol/sockjs-protocol-0.3.html#section-11
          headers.remove(EXPIRES);
          headers.remove(LAST_MODIFIED);
          headers.set(CACHE_CONTROL, "no-store, no-cache, must-revalidate, max-age=0");
      }
docs: Prevents client cache.
  Note that "pragma: no-cache" is linked to requests, not responses:
  http://palizine.plynt.com/issues/2008Jul/cache-control-attributes/