code: func decodeRemoteAddr(data []byte) string {
  	// data will never be empty for a Cookie that we generated. Check it to be on the safe side
  	if len(data) == 0 {
  		return ""
  	}
  	if data[0] == cookiePrefixIP {
  		return net.IP(data[1:]).String()
  	}
  	return string(data[1:])
  }
docs: // decodeRemoteAddr decodes the remote address saved in the Cookie