404. That’s an error.

The requested URL /catalog/product_compare/add/product/2723/uenc/aHR0cDovL3d3dy5sZW9uc2FmZXR5cHJvZHVjdHMuY29tL2ZvbGRpbmctc3ByaW5nLWFzc2lzdGVkLWJsYWNrLWtuaWZlLmh0bWw,/form_key/zU0cMDv3hjjWNoCJ/ was not found on this server. That’s all we know.