404. That’s an error.

The requested URL /users/oauth/?server=facebook&nv_redirect=-IVWDWwxCGxNIjPzTF0CDG3aoFa6NJ5K4tWmYA-U3hq11leB7QomjdraKo7Kx4iQWJok4BjCnQO9JQIn2AdGdoUg-FwZ0U622ZM3H-6HD8w%2C was not found on this server. That’s all we know.