Hi,

We have an application load balancer that is targeting a lambda. We want to update its listener's rule to return fixed response 403 by default and forward actions to target group (of type lambda) if path is /test and method is post.
This is doable via management console.
With cdk and cloudformation template it throws error:
Protocol cannot be specified for target groups with target type 'lambda'

In management console we have this for listener:

Rule                condition                                              action
1                 IF: Http method is post                            THEN: Forward to target group
                      Path is /test
last              IF: Requests otherwise not routed                  THEN: Return fixed response 403

Reproduction Steps

    let target = new targets.LambdaTarget(this.lambda)
    let applicationLoadBalancerTargetGroup = new elb.ApplicationTargetGroup(this, 'GatewayTargetGroup', {
          port: 443,
          vpc: this.vpc,
          targets: [target]
     })
    let applicationLoadBalancerListener = this.applicationLoadBalancer.addListener('test', {
      port: 443,
      protocol: elb.Protocol.HTTPS,
      certificateArns: [this.cert], 
      defaultAction: elb.ListenerAction.fixedResponse(403, {
        contentType: elb.ContentType.APPLICATION_JSON,
        messageBody: 'Forbidden'
      })
    })
    let applicationLoadBalancerPathListenerRule = new elb.ApplicationListenerRule(this, 'PathListenerRule', {
      listener: applicationLoadBalancerListener,
      priority: 1,
      conditions:[
        elb.ListenerCondition.httpRequestMethods(['POST']),
        elb.ListenerCondition.pathPatterns(['/test'])
      ],
      action: elb.ListenerAction.forward([applicationLoadBalancerTargetGroup])
  })

What did you expect to happen?

To be able to update rules same as what is doable in management console

What actually happened?

cloudformation stack failed with: Protocol cannot be specified for target groups with target type 'lambda'

I understand according to this https://docs.aws.amazon.com/cdk/api/latest/docs/aws-elasticloadbalancingv2-readme.html#protocol-for-load-balancer-targets
seems like creating application target group is only limited to instance type or ip. If that is the case here, is there a workaround to be able to do this in cdk?

Environment

• CDK CLI Version : 1.68.0
• Node.js Version: v13.6.0
• OS : macOS Mojave version 10.14.6
• Language (Version): TypeScript

Other

This is 🐛 Bug Report