400. That’s an error.
Error: redirect_uri_mismatch
The redirect URI in the request, http://opeanut.com/wp-content/plugins/wordpress-social-login/hybridauth/?hauth.done=Google, does not match the ones authorized for the OAuth client. Visit https://console.developers.google.com/apis/credentials/oauthclient/XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX.apps.googleusercontent.com?project=138921889767 to update the authorized redirect URIs.
구글 로그인에서 잘 안될경우
https://console.developers.google.com/
참조 : https://developers.google.com/identity/protocols/OpenIDConnect#setredirecturi