code: @GET
      public String suspend() {
          AtmosphereResource r = (AtmosphereResource)req.getAttribute("org.atmosphere.cpr.AtmosphereResource");
          r.setBroadcaster(r.getAtmosphereConfig().getBroadcasterFactory().lookup("/cxf-chat", true)).suspend();
          return "";
      }
docs: Suspend the response without writing anything back to the client.
  
  @return a white space