404. That’s an error.

The requested URL /catalog/product_compare/add/product/479/uenc/aHR0cDovL2NsZWFudHVuaW5nLmNvbS9ibXctMy1zZXJpZXMtMDItMDUtc2VkYW4tZnJvbnQtZ3JpbGxlLWZsYXQtYmxhY2stbWF0dGUtc2V0LWN0LWJtdzM0NjMxLmh0bWw,/ was not found on this server. That’s all we know.