404. That’s an error.

The requested URL /catalog/product_compare/add/product/2725/uenc/aHR0cDovL3d3dy5sZW9uc2FmZXR5cHJvZHVjdHMuY29tL2ZvbGRpbmctc3ByaW5nLWFzc2lzdGVkLW9yYW5nZS1jYW1vLWtuaWZlLmh0bWw,/form_key/WB3VA08tEKDR8tVk/ was not found on this server. That’s all we know.