404. That’s an error.

The requested URL /users/oauth/?server=facebook&nv_redirect=K4Hh-4XM8rk1bprhLZ7rvjnvWSAmJ3bRhctzd0XZecIJ_SygeaOq-PEiSNQ4r-u3a_lHYtZUnU--NPVlYQ95szAk1LzM5lYN0cb1W7lRzTg%2C was not found on this server. That’s all we know.