404. That’s an error.
The requested URL /shop/index.php/catalog/product_compare/add/product/117/uenc/aHR0cDovL3RlY2hub2ZveC5kZS9zaG9wL2luZGV4LnBocC9iYXVlbGVtZW50ZS90cmFuc2Zvcm1hdG9yZW4uaHRtbA,,/form_key/BMWzokPgFkb2ZRBG/
was not found on this server. That’s all we know.