Cookie Validation is a type of Web Challenge that is used in DDoS mitigation to filter out attackers from legitimate clients. The challenge is to send every client, attacker and legitimate user a web cookie and to request that the client send it back (typically using the HTTP 302 Redirect command). A virtually legitimate browser supports web cookies and will easily pass the challenge transparently (without the user’s notice), while DDoS bots typically don’t save cookies and therefore cannot pass the challenge.
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