code: func Vhost() string {
  	// Vhost
  	vhLock.Lock()
  	defer vhLock.Unlock()
  	vh := os.Getenv("STOMP_VHOST")
  	if vh != "" {
  		vhost = vh
  	} else {
  		vhost = Host()
  	}
  	return vhost
  }
docs: // Vhost returns a default vhost name.