type httpListener struct {
	opts        TCPOptions
	listeners   []net.Listener    // underlying TCP listeners.
	acceptCh    chan acceptResult // channel where all TCP listeners write accepted connection.
	ctx         context.Context
	ctxCanceler context.CancelFunc
}

// start - starts separate goroutine for each TCP listener.  A valid new connection is passed to httpListener.acceptCh.

  {{.Name}} - {{.Usage}}

USAGE:
  {{.Name}} {{if .VisibleFlags}}[FLAGS]{{end}} METAFILES...

Multiple files can be added. Files ending in '.zip' will be searched
for 'xl.meta' files. Wildcards are accepted: 'testdir/*.txt' will compress
all files in testdir ending with '.txt', directories can be wildcards
as well. 'testdir/*/*.txt' will match 'testdir/subdir/b.txt', double stars

// Write is non-blocking, if the writer's queue is not full.
// Write is blocking otherwise.
func (w *Writer) Write(p []byte) (n int, err error) {
	return w.pw.Write(p)
}

// Close closes the writer.
// Any accepted writes will be flushed. Any new writes will be rejected.
// Once Close() exits, files are synchronized to disk.
func (w *Writer) Close() error {
	w.pw.CloseWithError(nil)

	if w.f != nil {

		writeErr := func(err error) {
			if err == nil {
				return
			}
			gridLogOnceIf(ctx, err, err.Error())
			resp := connectResp{
				ID:             m.ID,
				Accepted:       false,
				RejectedReason: err.Error(),
			}
			if b, err := resp.MarshalMsg(nil); err == nil {
				msg := message{
					Op:      OpConnectResponse,
					Payload: b,
				}

			if debugPrint {
				fmt.Println(c.Local, "receive err:", err, "side:", c.side)
			}
			retry(err)
			continue
		}
		if debugPrint {
			fmt.Println(c.Local, "Got connectResp:", r)
		}
		if !r.Accepted {
			retry(fmt.Errorf("connection rejected: %s", r.RejectedReason))
			continue
		}
		c.reconnectMu.Lock()
		remoteUUID := uuid.UUID(r.ID)
		if c.remoteID != nil {
			c.reconnected()
		}

	}

	// Drain any response.
	xhttp.DrainBody(resp.Body)

	switch resp.StatusCode {
	case http.StatusOK, http.StatusCreated, http.StatusAccepted, http.StatusNoContent:
		// accepted HTTP status codes.
		return nil
	case http.StatusForbidden:
		return fmt.Errorf("%s returned '%s', please check if your auth token is correctly set", h.Endpoint(), resp.Status)
	default:

	// Its necessary to set the "X-Amz-Copy-Source" header for the request to be accepted by the handler.
	nilReq.Header.Set("X-Amz-Copy-Source", url.QueryEscape(SlashSeparator+nilBucket+SlashSeparator+nilObject))

	// execute the object layer set to `nil` test.