// 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
}

		}
		newKey, err := GlobalKMS.GenerateKey(ctx, &kms.GenerateKeyRequest{
			Name:           newKeyID,
			AssociatedData: kmsCtx,
		})
		if err != nil {
			return err
		}

		sealedKey := objectKey.Seal(newKey.Plaintext, crypto.GenerateIV(rand.Reader), crypto.S3KMS.String(), bucket, object)
		crypto.S3KMS.CreateMetadata(metadata, newKey.KeyID, newKey.Ciphertext, sealedKey, cryptoCtx)
		return nil

		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.

		writeErrorResponse(ctx, w, errorCodes.ToAPIErr(ErrInvalidSSECustomerAlgorithm), r.URL)
		return
	}

	var oldKey, newKey []byte
	var newKeyID string
	var kmsCtx kms.Context
	var objEncKey crypto.ObjectKey
	sseCopyKMS := crypto.S3KMS.IsEncrypted(srcInfo.UserDefined)
	sseCopyS3 := crypto.S3.IsEncrypted(srcInfo.UserDefined)