code: func (nc *Conn) Servers() []string {
  	nc.mu.RLock()
  	defer nc.mu.RUnlock()
  	return nc.getServers(false)
  }
docs: // Servers returns the list of known server urls, including additional
  // servers discovered after a connection has been established.  If
  // authentication is enabled, use UserInfo or Token when connecting with
  // these urls.