rsapi/auth.go
func (s *oAuthSigner) CanAuthenticate(host string) error {
	return testAuth(s, s.client, host, false)
}
func (s *oAuthSigner) CanAuthenticate(host string) error {
	return testAuth(s, s.client, host, false)
}
// CanAuthenticate makes a test request to CM 1.5 and returns nil if it is successful.