cilium

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---
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apiVersion: gateway.networking.k8s.io/v1
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kind: Gateway
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metadata:
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  name: cilium-gw
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spec:
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  gatewayClassName: cilium
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  listeners:
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  - protocol: HTTP
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    port: 80
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    name: web-gw-echo
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    allowedRoutes:
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      namespaces:
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        from: Same
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---
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apiVersion: gateway.networking.k8s.io/v1
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kind: HTTPRoute
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metadata:
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  name: header-http-echo
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spec:
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  parentRefs:
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    - name: cilium-gw
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  rules:
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    - matches:
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        - path:
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            type: PathPrefix
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            value: /add-a-request-header
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      filters:
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        - type: RequestHeaderModifier
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          requestHeaderModifier:
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            add:
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              - name: my-header-name
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                value: my-header-value
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      backendRefs:
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        - name: echo-1
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          port: 8080