AWS WAF introduces dynamic label interpolation for custom request and response handling

AWS WAF Dynamic Label Interpolation

AWS WAF now supports dynamic label interpolation, enabling you to forward WAF classification signals to your origin and embed context in responses with a single rule. Security engineers can now use ${namespace:} syntax in custom request headers, response headers, and response bodies to forward an entire label namespace at once.

Interpolation introduces synthetic labels: built-in values resolved from request context, including client IP address, WAF request ID, and JA3 and JA4 fingerprints. These can be embedded in custom block pages and challenge pages for user reference or forwarded to your application for adaptive authentication decisions.

Dynamic label interpolation is available in all AWS Regions where AWS WAF is available at no additional cost. To get started, see Dynamic label interpolation in the AWS WAF Developer Guide, or explore the sample on GitHub.

What to do

• Review the AWS WAF Developer Guide for dynamic label interpolation details.
• Explore the sample on GitHub to see dynamic label interpolation in action.

Source: AWS release notes

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