apiVersion: networking.istio.io/v1beta1
kind: VirtualService
metadata:
  name: geth-dedicated
  namespace: default
spec:
  gateways:
  - geth-dedicated
  hosts:
  - <domain>
  http:
  - match:
    - uri:
        prefix: /
    name: geth-public
    route:
    - destination:
        host: geth-dedicated
        port:
          number: 8545
---
apiVersion: networking.istio.io/v1alpha3
kind: EnvoyFilter
metadata:
  name: dumb-filter
  namespace: istio-system
spec:
  workloadSelector:
    labels:
      istio: ingressgateway
  configPatches:
  - applyTo: HTTP_ROUTE
    match:
      routeConfiguration:
        vhost:
          route:
            # name from virtual service route that the filter should apply to
            name: geth-public
    patch:
      operation: MERGE
      value:
        # 'custom' as prefix, can be anything
        name: custom.dumb-filter
        # set lua per route filter
        typed_per_filter_config:
          envoy.filters.http.lua:
            "@type": type.googleapis.com/envoy.extensions.filters.http.lua.v3.LuaPerRoute
            source_code:
              inline_string: |
                function envoy_on_response(response_handle)
                  response_handle:headers():add("dm3ch-test", "dm3ch")
                  response_handle:logErr("Bye Bye.")
                end