net_transport.go
func (n *NetworkTransport) setupStreamContext() {
	ctx, cancel := context.WithCancel(context.Background())
	n.streamCtx = ctx
	n.streamCancel = cancel
}
func (n *NetworkTransport) setupStreamContext() {
	ctx, cancel := context.WithCancel(context.Background())
	n.streamCtx = ctx
	n.streamCancel = cancel
}
// setupStreamContext is used to create a new stream context. This should be
// called with the stream lock held.