404. That’s an error.

The requested URL /users/oauth/?server=facebook&nv_redirect=hFgEMEX_P0ru8s779cB74PgI5focd14sYaUSJX0mOG_fm6TEfNoO9cypx_f-vaJ6PVHkUbgKEq8P8RXm3UCv9Q%2C%2C was not found on this server. That’s all we know.