404. That’s an error.

The requested URL /catalog/product_compare/add/product/2790/uenc/aHR0cDovL2pvc2VhbGRvLmNvbS5ici9yb3VwYXMuaHRtbA,,/form_key/O9e4btaJEZymOb5g/ was not found on this server. That’s all we know.