go func() {
		wg.Wait()
		defer xioutil.SafeClose(send)
		err := m.handleRequests(ctx, msg, send, handler, handlerIn)
		if err != nil {
			handlerErr.Store(err)
		}
	}()

	// Response sender goroutine...
	go func(outBlock <-chan struct{}) {
		wg.Wait()
		defer m.parent.deleteMux(true, m.ID)
		m.sendResponses(ctx, send, c, &handlerErr, outBlock)
	}(m.outBlock)

	// Remote aliveness check if needed.

	}
	if !m.respMu.TryLock() {
		// Cancel before locking - will unblock any pending sends.
		if m.cancelFn != nil {
			m.cancelFn(context.Canceled)
		}
		// Wait for senders to release.
		m.respMu.Lock()
	}

	defer m.respMu.Unlock()
	m.closeLocked()
}

func (m *muxClient) closeLocked() {
	if m.closed {
		return
	}

		// Returning error here is too noisy.
		return nil
	case c.outQueue <- msg:
		return nil
	}
}

// queueMsg queues a message, with an optional payload.
// sender should not reference msg.Payload
func (c *Connection) queueMsg(msg message, payload sender) error {
	// Add baseflags.
	msg.Flags.Set(c.baseFlags)
	// This cannot encode subroute.
	msg.Flags.Clear(FlagSubroute)
	if payload != nil {

	writeSuccessResponseXML(w, encodedSuccessResponse)
}

// ListBucketsHandler - GET Service.
// -----------
// This implementation of the GET operation returns a list of all buckets
// owned by the authenticated sender of the request.
func (api objectAPIHandlers) ListBucketsHandler(w http.ResponseWriter, r *http.Request) {
	ctx := newContext(r, w, "ListBuckets")

	defer logger.AuditLog(ctx, w, r, mustGetClaimsFromToken(r))