// it waits for the frame to be written.
	//
	// As an exception to this rule, we allow sending RST_STREAM after close.
	// This allows us to immediately reject new streams without tracking any
	// state for those streams (except for the queued RST_STREAM frame). This
	// may result in duplicate RST_STREAMs in some cases, but the client should
	// ignore those.
	if wr.StreamID() != 0 {