IstioMetaJSONPrefix = "ISTIO_METAJSON_"

	lightstepAccessTokenBase = "lightstep_access_token.txt"

	// required stats are used by readiness checks.
	requiredEnvoyStatsMatcherInclusionPrefixes = "cluster_manager,listener_manager,server,cluster.xds-grpc,wasm"

	rbacEnvoyStatsMatcherInclusionSuffix = "rbac.allowed,rbac.denied,shadow_allowed,shadow_denied"

	lastAlpn *atomic.String
}

const (
	testHeader      = "Some-Header"
	testHeaderValue = "some-value"
	testHostValue   = "test.com:9999"
)

var liveServerStats = "cluster_manager.cds.update_success: 1\nlistener_manager.lds.update_success: 1\nserver.state: 0\nlistener_manager.workers_started: 1"

func (h *handler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
	h.lastAlpn.Store(r.Proto)