This is done through standard HTTP/2 pooling.
The pooling is keyed off the `{source identity, destination identity, destination ip}`.

### Headers

Ztunnel uses the following well-known headers in HBONE:

                      type: object
                    rewrite:
                      description: Rewrite HTTP URIs and Authority headers.
                      properties:
                        authority:
                          description: rewrite the Authority/Host header with this
                            value.
                          type: string
                        uri:

  // contain duplicate certificates, or that use PEM block headers.
  //
  // Users of ClusterTrustBundles, including Kubelet, are free to reorder and
  // deduplicate certificate blocks in this file according to their own logic,
  // as well as to drop PEM block headers and inter-block data.
  optional string trustBundle = 2;

                      type: object
                    rewrite:
                      description: Rewrite HTTP URIs and Authority headers.
                      properties:
                        authority:
                          description: rewrite the Authority/Host header with this
                            value.
                          type: string
                        uri:

	}
	if match.GetPath() != "" {
		conds = append(conds, match.GetPath())
	}
	if match.GetSafeRegex() != nil {
		conds = append(conds, fmt.Sprintf("regex %s", match.GetSafeRegex().Regex))
	}
	// Ignore headers
	return strings.Join(conds, " ")
}

// PrintListenerDump prints the relevant listeners in the config dump to the ConfigWriter stdout

                            "typed_config": {
                              "@type": "type.googleapis.com/envoy.extensions.filters.http.set_filter_state.v3.Config",
                              "on_request_headers": [
                                {
                                  "object_key": "envoy.filters.listener.original_dst.local_ip",
                                  "format_string": {

outputClaimToHeaders: description: This field specifies a list of operations to copy the claim to HTTP headers on a successfully verified token. items: properties: claim: description: The name of the claim to be copied from. type: string header: description: The name of the header to be created. type: string type: object type: array outputPayloadToHeade: description: This field specifies the header name to output a successfully verified JWT payload to the backend. type: string required: - issuer type:...

{{ $mcsAPIGroup := or .Values.pilot.env.MCS_API_GROUP "multicluster.x-k8s.io" }}
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
  name: istio-reader-clusterrole{{- if not (eq .Values.revision "")}}-{{ .Values.revision }}{{- end }}-{{ .Release.Namespace }}
  labels:
    app: istio-reader
    release: {{ .Release.Name }}
rules:
  - apiGroups:
      - "config.istio.io"
      - "security.istio.io"
      - "networking.istio.io"

# This service account aggregates reader permissions for the revisions in a given cluster
# Should be used for remote secret creation.
apiVersion: v1
kind: ServiceAccount
  {{- if .Values.global.imagePullSecrets }}
imagePullSecrets:
  {{- range .Values.global.imagePullSecrets }}
  - name: {{ . }}
    {{- end }}
    {{- end }}
metadata:
  name: istio-reader-service-account
  namespace: {{ .Values.global.istioNamespace }}
  labels:

            "cluster": "connect_originate",
            "tunneling_config": {
             "hostname": "%DOWNSTREAM_LOCAL_ADDRESS%",
             "headers_to_add": [
              {
               "header": {
                "key": "baggage",
                "value": "k8s.cluster.name=Kubernetes,k8s.namespace.name=default,k8s.deployment.name=httpbin,service.name=httpbin,service.version=v1"