404. That’s an error.

The requested URL /catalog/product_compare/add/product/298/uenc/aHR0cDovL2NsZWFudHVuaW5nLmNvbS9ibXctNS1zZXJpZXMtM3ctNjAwMGstbGVkLXN1cGVyLWJyaWdodC13aGl0ZS1hbmdlbC1leWVzLW1hcmtlci1saWdodHMtcmluZy1raXQtY3QtaHctZTM5LWU4Ny11bmktd2hpdGUtMi5odG1s/ was not found on this server. That’s all we know.