404. That’s an error.

The requested URL /catalog/product_compare/add/product/19/uenc/aHR0cDovL2NsZWFudHVuaW5nLmNvbS9zY29waW9uZS1ibXctZTYwLTUtc2VyaWVzLWNhcmJvbi1maWJlci1jZi1waWxsYXJzLWN0LTA2MDE2MTZiLmh0bWw,/ was not found on this server. That’s all we know.