You tried going to https://blog.mistra.fr/wp-content/plugins/wordpress-social-login/authenticate.php?provider=Google&redirect_to=http%3A%2F%2Fblog.mistra.fr%2Fgoogle-annonce-la-premiere-version-stable-de-son-langage-go
, and it doesn't exist. All is not lost! You can search for what you're looking for.