The redirect URI in the request, http://die-erben-ashans.de/google-auth/, does not match the ones authorized for the OAuth client. To update the authorized redirect URIs, visit: https://console.developers.google.com/apis/credentials/oauthclient/918740793142-b05nfdf6n30tgetnbmn7s6173f45sjv0.apps.googleusercontent.com?project=918740793142