public function keepAlive()
 {
     $this->handler->keepAlive();
 }
 /**
  *
  * @param Protocol $protocol
  * @param string $ssl
  * @param string $host
  * @param integer $port
  */
 public function __construct($protocol, $ssl, $host, $port)
 {
     parent::__construct($protocol, $ssl, $host, $port);
     $this->open();
 }