class AuthenticationMethodRetriever implements RegistryEndpointProvider<Optional<RegistryAuthenticator>> {

  @Nullable
  @Override
  public BlobHttpContent getContent() {
    return null;
  }

    AuthenticationMethodRetriever(
      RegistryEndpointRequestProperties registryEndpointRequestProperties,
      @Nullable String userAgent,
      FailoverHttpClient httpClient);

}