usageOfAction

Determines whether to use the AWSManagedRulesAntiDDoSRuleSet rules ChallengeAllDuringEvent and ChallengeDDoSRequests in the rule group evaluation and the related label awswaf:managed:aws:anti-ddos:challengeable-request.

• If usage is enabled:

• The managed rule group adds the label awswaf:managed:aws:anti-ddos:challengeable-request to any web request whose URL does NOT match the regular expressions provided in the ClientSideAction setting ExemptUriRegularExpressions.

• The two rules are evaluated against web requests for protected resources that are experiencing a DDoS attack. The two rules only apply their action to matching requests that have the label awswaf:managed:aws:anti-ddos:challengeable-request.

• If usage is disabled:

• The managed rule group doesn't add the label awswaf:managed:aws:anti-ddos:challengeable-request to any web requests.

• The two rules are not evaluated.

• None of the other ClientSideAction settings have any effect.

This setting only enables or disables the use of the two anti-DDOS rules ChallengeAllDuringEvent and ChallengeDDoSRequests in the anti-DDoS managed rule group.

This setting doesn't alter the action setting in the two rules. To override the actions used by the rules ChallengeAllDuringEvent and ChallengeDDoSRequests, enable this setting, and then override the rule actions in the usual way, in your managed rule group configuration.