404. That’s an error.

The requested URL /catalog/product_compare/add/product/2841/uenc/aHR0cDovL2pvc2VhbGRvLmNvbS5ici9hY2Vzc29yaW9zL2NoaW5lbG9zLmh0bWw,/form_key/uTSCZOwZ6mb4DYYS/ was not found on this server. That’s all we know.