istio

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apiVersion: networking.istio.io/v1alpha3
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kind: ServiceEntry
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metadata:
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  name: appendh
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  namespace: testns
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spec:
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   hosts:
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   - appendh.test.istio.io
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   ports:
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   - number: 80
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     name: http
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     protocol: HTTP
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   resolution: STATIC
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   endpoints:
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    - address: 127.0.0.2
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      ports:
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        http: 7072
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---
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apiVersion: networking.istio.io/v1alpha3
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kind: VirtualService
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metadata:
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  name: appendh-route
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  namespace: testns
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spec:
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  hosts:
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    - appendh.test.istio.io
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  http:
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    - route:
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      - destination:
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          host: appendh.test.istio.io
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      headers:
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        request:
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          add:
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            istio-custom-header: user-defined-value
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