Cannot extend timeout from JAX-RS timeout handler

 public class MyTimeoutHandler implements TimeoutHandler {
     …
     public void handleTimeout(AsyncResponse ar) {
         if (keepSuspended) {
             ar.setTimeout(10, SECONDS);
         } else if (cancel) {
             ar.cancel(retryPeriod);
         } else {
             ar.resume(defaultResponse);
         }
     }
     …
 }