// provided (*Request).Method value.
func urlErrorOp(method string) string {
	if method == "" {
		return "Get"
	}
	if lowerMethod, ok := ascii.ToLower(method); ok {
		return method[:1] + lowerMethod[1:]
	}
	return method
}

// Do sends an HTTP request and returns an HTTP response, following
// policy (such as redirects, cookies, auth) as configured on the
// client.