customResponseBodies
A map of custom response keys and content bodies. When you create a rule with a block action, you can send a custom response to the web request. You define these for the web ACL, and then use them in the rules and default actions that you define in the web ACL.
For information about customizing web requests and responses, see Customizing web requests and responses in WAF in the WAF Developer Guide.
For information about the limits on count and size for custom request and response settings, see WAF quotas in the WAF Developer Guide.