// the upstream cluster will use HTTP2.
		cb.setUseDownstreamProtocol(mc)
	}
}

// applyH2Upgrade function will upgrade cluster to http2 if specified by configuration.
// applyH2Upgrade can only be called for outbound cluster
func (cb *ClusterBuilder) applyH2Upgrade(mc *clusterWrapper, port *model.Port,
	mesh *meshconfig.MeshConfig, connectionPool *networking.ConnectionPoolSettings,
) {