code: @POST
      @Path("broadcast")
      public String manualDelayBroadcast(@FormParam("message") String message) {
          broadcaster.delayBroadcast(message, 10, TimeUnit.SECONDS);
          return message;
      }
docs: Use the {@link Broadcaster#delayBroadcast(java.lang.Object)} directly
  instead of using the annotation.
  
  @param message A String from an HTML form
  @return A {@link Broadcastable} used to broadcast events.