gRPC Bidirectional Stream WAF ACL Support

To my knowledge AWS WAF can apply rules based on request attributes such as URI, headers, and query parameters, but it doesn't directly deal with limiting the number of requests per IP address once a stream is established.

For rate limiting or throttling based on the number of requests per IP once a stream is established, you might want to consider using AWS services like Amazon API Gateway or AWS lamdba in conjunction with AWS WAF.