404. That’s an error.
The requested URL /catalog/product_compare/add/product/5488/uenc/aHR0cDovL3d3dy5idXlpbmdmdXJuaXR1cmUuY28udWsvYmVkcm9vbS1mdXJuaXR1cmUvZHJhd2VyLWNoZXN0cw,,/form_key/6fv3loH0aD5Dw7ut/
was not found on this server. That’s all we know.