code: @Handler(priority = Integer.MIN_VALUE)
      public void onOptions(Request.In.Options event, IOSubchannel appChannel) {
          if (event.requestUri() == HttpRequest.ASTERISK_REQUEST) {
              HttpResponse response = event.httpRequest().response().get();
              response.setStatus(HttpStatus.OK);
              appChannel.respond(new Response(response));
              event.setResult(true);
              event.stop();
          }
      }
docs: Provides a fallback handler for an OPTIONS request with asterisk. Simply
  responds with "OK".
  
  @param event the event
  @param appChannel the application channel