404. That’s an error.
The requested URL /catalog/product_compare/add/product/2252/uenc/aHR0cHM6Ly9zaW1wbGEuYXo6ODA4MC9oZXl2YW4tbWVoc3VsbGFyaS9oZXl2YW4teWVtZWtsZXJpLmh0bWw,/form_key/DZVBBMVkPjgjBlou/
was not found on this server. That’s all we know.