404. That’s an error.

The requested URL /catalog/product_compare/add/product/2625/uenc/aHR0cDovL3d3dy5sZW9uc2FmZXR5cHJvZHVjdHMuY29tL2Zhc2hpb25hYmxlLWxpcHN0aWNrLWFsYXJtLWJsYWNrLmh0bWw,/form_key/JT9c8VUW9bOkE08f/ was not found on this server. That’s all we know.