The redirect URI in the request, https://app02-stl1.theoldreader.com/users/auth/google_oauth2/callback, 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/311017656802-7qfrbf8i06r3dh2bat4a8o4304g21ahn.apps.googleusercontent.com?project=311017656802