Custom HTTP response on request time out

CustomHTTPAsyncTimeoutResponse.txt

@GET
public void async(@Suspended AsyncResponse ar) {
  ar.setTimeout(3, TimeUnit.SECONDS);
  ar.setTimeoutHandler(new TimeoutHandler() {
    @Override
      public void handleTimeout(AsyncResponse asyncResponse) {
          asyncResponse.resume(Response.accepted(UUID.randomUUID().toString()).build()); //sending HTTP 202 (Accepted)
      }
  });
  ......