Unknown     FilterChainType = "unknown"
)

func classifyFilterChain(have *listener.FilterChain) FilterChainType {
	fcm := have.GetFilterChainMatch()
	alpn := sets.New(fcm.GetApplicationProtocols()...)
	switch fcm.GetTransportProtocol() {
	case xdsfilters.TLSTransportProtocol:
		if alpn.Contains("istio-http/1.1") {
			return MTLSHTTP
		}
		if alpn.Contains("istio") {
			return MTLSTCP
		}