How to set a public LB route to a proxy on AWS?

I built this traffic route in a VPC.

Route53->ACM(SSL)->Public ALB->EC2(Nginx proxy)->Private ALB->ECS(Internal App)

The EC2's security group is allowing tcp 80 and 443. The ECS' security group is allowing 80 from EC2's security group.

When I access the domain registered in Route53, it got 504 DNS look up failed error. When access the public ALB's DNS name got 503 Service Temporarily Unavailable error.

I'm sure the ACM is setting and the public LB's DNS name is registering to the Route53 with the domain.

The ALB settings on the public subnet are doing by Terraform

resource "aws_lb_listener" "http" {
  load_balancer_arn = aws_lb.this.arn
  port              = "80"
  protocol          = "HTTP"

  default_action {
    type = "redirect"

    redirect {
      port        = "443"
      protocol    = "HTTPS"
      status_code = "HTTP_301"
    }
  }
}

resource "aws_lb_listener_rule" "http_redirect" {
  listener_arn = aws_lb_listener.proxy.arn
  priority     = 1

  action {
    type = "redirect"

    redirect {
      port        = "443"
      protocol    = "HTTPS"
      status_code = "HTTP_301"
    }
  }

  condition {
    path_pattern {
      values = ["/*"]
    }
  }
}

resource "aws_lb_listener_rule" "http_forward" {
  listener_arn = aws_lb_listener.http.arn
  priority     = 2

  action {
    type             = "forward"
    target_group_arn = aws_lb_target_group.proxy.arn
  }

  condition {
    host_header {
      values = ["proxy.portsite.com"]
    }
  }
}

resource "aws_lb_listener_rule" "https_forward" {
  listener_arn = aws_lb_listener.https.arn

  action {
    type             = "forward"
    target_group_arn = aws_lb_target_group.proxy.arn
  }

  condition {
    host_header {
      values = ["proxy.portsite.com"]
    }
  }
}

Are both http_redirect and http_forward necessary for the routing? Or only http_redirect is good? And, does the issue caused by it?