func HandleWriteValue(w http.ResponseWriter, req *http.Request, ps URLParams, cs chunks.ChunkStore) {
	hashes := hash.HashSlice{}
	err := d.Try(func() {
		d.Exp.Equal("POST", req.Method)

		reader := bodyReader(req)
		defer func() {
			// Ensure all data on reader is consumed
			io.Copy(ioutil.Discard, reader)
			reader.Close()
		}()
		vbs := types.NewValidatingBatchingSink(cs)
		vbs.Prepare(deserializeHints(reader))

		chunkChan := make(chan *chunks.Chunk, 16)
		go chunks.DeserializeToChan(reader, chunkChan)
		var bpe chunks.BackpressureError
		for c := range chunkChan {
			if bpe == nil {
				bpe = vbs.Enqueue(*c)
			} else {
				bpe = append(bpe, c.Hash())
			}
			// If a previous Enqueue() errored, we still need to drain chunkChan
			// TODO: what about having DeserializeToChan take a 'done' channel to stop it?
			hashes = append(hashes, c.Hash())
		}
		if bpe == nil {
			bpe = vbs.Flush()
		}
		if bpe != nil {
			w.WriteHeader(httpStatusTooManyRequests)
			w.Header().Add("Content-Type", "application/octet-stream")
			writer := respWriter(req, w)
			defer writer.Close()
			serializeHashes(writer, bpe.AsHashes())
			return
		}
		w.WriteHeader(http.StatusCreated)
	})

	if err != nil {
		http.Error(w, fmt.Sprintf("Error: %v\nChunks in payload: %v", err, hashes), http.StatusBadRequest)
		return
	}
}
func handleWriteValue(w http.ResponseWriter, req *http.Request, ps URLParams, cs chunks.ChunkStore) {
	d.PanicIfTrue(req.Method != "POST", "Expected post method.")

	reader := bodyReader(req)
	defer func() {
		// Ensure all data on reader is consumed
		io.Copy(ioutil.Discard, reader)
		reader.Close()
	}()
	tc := types.NewTypeCache()
	vbs := types.NewValidatingBatchingSink(cs, tc)
	vbs.Prepare(deserializeHints(reader))

	chunkChan := make(chan *chunks.Chunk, 16)
	go chunks.DeserializeToChan(reader, chunkChan)
	var bpe chunks.BackpressureError
	for c := range chunkChan {
		if bpe == nil {
			bpe = vbs.Enqueue(*c)
		} else {
			bpe = append(bpe, c.Hash())
		}
		// If a previous Enqueue() errored, we still need to drain chunkChan
		// TODO: what about having DeserializeToChan take a 'done' channel to stop it?
	}
	if bpe == nil {
		bpe = vbs.Flush()
	}
	if bpe != nil {
		w.WriteHeader(httpStatusTooManyRequests)
		w.Header().Add("Content-Type", "application/octet-stream")
		writer := respWriter(req, w)
		defer writer.Close()
		serializeHashes(writer, bpe.AsHashes())
		return
	}
	w.WriteHeader(http.StatusCreated)
}