Krakend configuration for multiple apps with same URL pattern about krakend-ce HOT 5 CLOSED

{
    "version": 3,
    "$schema": "https://www.krakend.io/schema/krakend.json",
    "host": [
        "http://localhost:8080"
    ],
    "echo_endpoint": true,
    "endpoints": [
        {
            "endpoint": "/all-domains",
            "backend": [
                {
                    "url_pattern": "/__echo/domain-A",
                    "allow": [
                        "req_uri"
                    ],
                    "group": "A"
                },
                {
                    "url_pattern": "/__echo/domain-B",
                    "allow": [
                        "req_uri"
                    ],
                    "group": "B"
                }
            ]
        },
        {
            "endpoint": "/one-domain",
            "backend": [
                {
                    "url_pattern": "/__echo/domain-A",
                    "allow": [
                        "req_uri"
                    ],
                    "group": "A",
                    "extra_config": {
                        "validation/cel": [
                            {
                                "check_expr": "'a.com' in req_headers['X-Forwarded-Host']"
                            }
                        ]
                    }
                },
                {
                    "url_pattern": "/__echo/domain-B",
                    "allow": [
                        "req_uri"
                    ],
                    "group": "B",
                    "extra_config": {
                        "validation/cel": [
                            {
                                "check_expr": "'b.com' in req_headers['X-Forwarded-Host']"
                            }
                        ]
                    }
                }
            ]
        }
    ]
}

curl -H'Host: z.com' http://localhost:8080/all-domains
curl -H'Host: a.com' http://localhost:8080/one-domain
curl -H'Host: b.com' http://localhost:8080/one-domain