auth := r.Header.Get("Authorization")
	if auth == "" {
		return "", "", false
	}
	return parseBasicAuth(auth)
}

// parseBasicAuth parses an HTTP Basic Authentication string.
// "Basic QWxhZGRpbjpvcGVuIHNlc2FtZQ==" returns ("Aladdin", "open sesame", true).
//
// parseBasicAuth should be an internal detail,
// but widely used packages access it using linkname.