404. That’s an error.
The requested URL /catalog/product_compare/add/product/2729/uenc/aHR0cDovL3d3dy5sZW9uc2FmZXR5cHJvZHVjdHMuY29tL2tuaXZlcy90aHJvd2luZy1zdGFycy0yMS5odG1s/form_key/7F7B20RdbbS2Bs5I/
was not found on this server. That’s all we know.