apiVersion: networking.istio.io/v1alpha3
kind: EnvoyFilter
metadata:
  name: copy-trace-headers-to-xb3-in-gateway
  namespace: istio-system
spec:
  workloadLabels:
    app: istio-ingressgateway
  filters:
  - filterConfig:
      inlineCode: |
        function envoy_on_request(request_handle)
          request_handle:headers():add("x-b3-traceid", request_handle:headers():get("x-custom-traceid"))
          request_handle:headers():add("new-header", request_handle:headers():get("old-header"))
        end
    filterName: envoy.lua
    filterType: HTTP
    insertPosition:
      index: FIRST
    listenerMatch:
      listenerType: GATEWAY
      listenerProtocol: HTTP