404. That’s an error.

The requested URL /catalog/product_compare/add/product/1788/uenc/aHR0cDovL3d3dy50aHJvd21lYXBpbGxvdy5jb20vd29yZC1waWxsb3cvZG9vcmtub2ItcGlsbG93cy5odG1s/ was not found on this server. That’s all we know.