code: func NetHandler(network, addr string, fmtr Format) (Handler, error) {
  	conn, err := net.Dial(network, addr)
  	if err != nil {
  		return nil, err
  	}
  
  	return closingHandler{conn, StreamHandler(conn, fmtr)}, nil
  }
docs: // NetHandler opens a socket to the given address and writes records
  // over the connection.