We need
- A lambda function:
- No need Function URL enabled
- VPC configs to be in the same VPC and subnet with main VPC used by ALB
- Security group with inbound from main VPC CIDR block (eg: 10.1.0.0/16) and outbound to internet (eg: 0.0.0.0/0)
- Permission set to accept both ALB arn and Target group arn
- A target group set to lambda function
- An application load balancer has a listener to lambda target group above
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