404. That’s an error.

The requested URL /catalog/product_compare/add/product/1109/uenc/aHR0cDovL3d3dy50aHJvd21lYXBpbGxvdy5jb20vdGFwZXN0cnktcGlsbG93L3dvcmQtcGlsbG93LXdpdGgtc2F5aW5nL2Z1bm55LXNheWluZ3MuaHRtbA,,/ was not found on this server. That’s all we know.