code: private String getServerIdVar()
    {
      String serverId = config().get("server.id");
  
      if (serverId == null) {
        int port = portServer();
  
        if (port > 0) { // && ! _serverConfig.isEphemeral()) {) {
          serverId = "embed-" + port;
        }
        else {
          serverId = "embed";
        }
      }
  
      return serverId;
    }
docs: /*
  protected ServerBuilder createDelegate()
  {
  return ServerBuilder.create(this);
  }