404. That’s an error.

The requested URL /catalog/product_compare/add/product/1690/uenc/aHR0cDovL3d3dy5sZW9uc2FmZXR5cHJvZHVjdHMuY29tL3BlcnNvbmFsLXNhZmV0eS9wZXJzb25hbC1hbGFybXMuaHRtbD9wPTI,/form_key/W59pH2nl5aRO1zjR/ was not found on this server. That’s all we know.