func HTTPClient(client *http.Client) Option {
	return func(c *config) {
		c.HTTPClient = client
	}
}
func HTTPClient(client *http.Client) Option {
	return func(c *config) {
		c.HTTPClient = client
	}
}
func HTTPClient ( client * http . Client ) Option { return func ( c * config ) { c . HTTPClient = client } }
// HTTPClient provides an Option for specifying a *http.Client
HTTPClient provides an Option for specifying a * http . Client