400. That’s an error.
Error: redirect_uri_mismatch
The redirect URI in the request, http://staging.changelog.qgis.org/en/accounts/google/login/callback/, does not match the ones authorized for the OAuth client. Visit https://console.developers.google.com/apis/credentials/oauthclient/965152363421-4vro5f27an4fgt7qlfrc0f48ajb2aojj.apps.googleusercontent.com?project=965152363421 to update the authorized redirect URIs.
on staging: