When using Lambda Function URLs with IAM auth type, the Authorization header is reserved for IAM authentication. If your backend app also needs an Authorization header, you can use a different header name and have the adapter rename it.

Configuration

Set AWS_LWA_AUTHORIZATION_SOURCE to the header name your client will use:

AWS_LWA_AUTHORIZATION_SOURCE=X-Custom-Auth

The adapter will replace X-Custom-Auth with Authorization before forwarding the request to your app.

This feature is disabled by default.