// FlagPayloadIsErr is used to signify that the payload is a string error converted to byte slice.
	// When a response is received, the mux is already removed from the remote.
	OpResponse

	// OpDisconnect instructs that remote wants to disconnect
	OpDisconnect

	// OpMerged is several operations merged into one.
	OpMerged
)

const (
	// FlagCRCxxh3 indicates that, the lower 32 bits of xxhash3 of the serialized

			return
		}
		if debugPrint {
			fmt.Println(c.Local, "Disconnected. Attempting to reconnect.")
		}
	}
}

func (c *Connection) disconnected() {
	c.outgoing.Range(func(key uint64, client *muxClient) bool {
		if !client.stateless {
			client.cancelFn(ErrDisconnected)
		}
		return true
	})
	if debugReqs {
		fmt.Println(c.String(), "Disconnected. Clearing outgoing.")
	}
	c.outgoing.Clear()

	}
	if debugPrint {
		fmt.Println("Connecting Mux", m.MuxID, ",to", m.parent.Remote)
	}

	// Space for one message and an error.
	responseCh := make(chan Response, 1)

	// Spawn simple disconnect
	if requests == nil {
		go m.handleOneWayStream(responseCh, responses)
		return &Stream{responses: responseCh, Requests: nil, ctx: m.ctx, cancel: m.cancelFn, muxID: m.MuxID}, nil
	}

		w.Header().Set("Content-Type", string(contentType))

		enc := expfmt.NewEncoder(w, contentType)
		for _, mf := range mfs {
			if err := enc.Encode(mf); err != nil {
				// client may disconnect for any reasons
				// we do not have to log this.
				return
			}
		}
		if closer, ok := enc.(expfmt.Closer); ok {
			closer.Close()
		}
	})
}

// NoAuthMiddleware no auth middle ware.

	}

	return target.send(eventData)
}

// Close - does nothing and available for interface compatibility.
func (target *MQTTTarget) Close() error {
	if target.client != nil {
		target.client.Disconnect(100)
	}
	close(target.quitCh)
	return nil
}

func (target *MQTTTarget) init() error {
	return target.initOnce.Do(target.initMQTT)
}

func (target *MQTTTarget) initMQTT() error {

		w.Header().Set("Content-Type", string(contentType))

		enc := expfmt.NewEncoder(w, contentType)
		for _, mf := range mfs {
			if err := enc.Encode(mf); err != nil {
				// client may disconnect for any reasons
				// we do not have to log this.
				return
			}
		}
		if closer, ok := enc.(expfmt.Closer); ok {
			closer.Close()
		}
	})
}

func (m *muxServer) checkSeq(seq uint32) (ok bool) {
	if seq != m.RecvSeq {
		if debugPrint {
			fmt.Printf("expected sequence %d, got %d\n", m.RecvSeq, seq)
		}
		m.disconnect(fmt.Sprintf("receive sequence number mismatch. want %d, got %d", m.RecvSeq, seq))
		return false
	}
	m.RecvSeq++
	return true
}

func (m *muxServer) message(msg message) {
	if debugPrint {

// the last peer to connect and the first peer to disconnect.
// This is to improve the RX throughput accuracy.
type netPerfRX struct {
	RX                uint64    // RX bytes
	lastToConnect     time.Time // time at which last peer to connect to us
	firstToDisconnect time.Time // time at which the first peer disconnects from us
	RXSample          uint64    // RX bytes between lastToConnect and firstToDisconnect

		o.Create = false
		o.ID = ""
		o.Transient = true
		return entries, errDiskFull
	}
	o.set = z.serverPools[o.pool].getHashedSetIndex(o.ID)
	saver := z.serverPools[o.pool].sets[o.set]

	// Disconnect from call above, but cancel on exit.
	listCtx, cancel := context.WithCancel(GlobalContext)
	saveCh := make(chan metaCacheEntry, metacacheBlockSize)
	inCh := make(chan metaCacheEntry, metacacheBlockSize)

		HTTPStatusCode: http.StatusServiceUnavailable,
	},
	ErrClientDisconnected: {
		Code:           "ClientDisconnected",
		Description:    "Client disconnected before response was ready",
		HTTPStatusCode: 499, // No official code, use nginx value.
	},
	ErrTooManyRequests: {
		Code:           "TooManyRequests",