// Use Call to initiate a clientside call.
func NewSingleHandler[Req, Resp RoundTripper](h HandlerID, newReq func() Req, newResp func() Resp) *SingleHandler[Req, Resp] {
	s := SingleHandler[Req, Resp]{id: h}
	s.newReq, s.recycleReq = recycleFunc[Req](newReq)
	s.newResp, s.recycleResp = recycleFunc[Resp](newResp)
	if _, ok := any(newReq()).(Recycler); ok {
		s.callReuseReq = true
	}
	return &s
}

		hexChunkSize, chunkSignature))
	newChunk, err := io.ReadAll(bufReader)
	if err != nil {
		return nil, err
	}
	newReq := req
	newReq.Body = io.NopCloser(
		bytes.NewReader(bytes.Join([][]byte{newChunkHdr, newChunk[:len(newChunk)/2]},
			[]byte(""))),
	)
	return newReq, nil
}

// Malform data given a request signed using streaming signature V4.