ipify

var Provider = ip.ProviderFunc(func() (net.IP, error) {
	req, err := http.NewRequest(http.MethodGet, "https://api.ipify.org", nil)
	if err != nil {
		return nil, err
	}

	ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
	defer cancel()

	resp, err := http.DefaultClient.Do(req.WithContext(ctx))
	if err != nil {
		if netErr, ok := err.(net.Error); ok {
			if netErr.Temporary() || netErr.Timeout() {

				return nil, nil
			}
		}

		return nil, err
	}
	defer resp.Body.Close()

	buf, err := ioutil.ReadAll(resp.Body)
	if err != nil {
		return nil, err
	}

	return net.ParseIP(string(buf)), nil
})