// 		// ReadIdleTimeout is the timeout after which a health check using ping
	// 		// frame will be carried out if no frame is received on the
	// 		// connection. 5 minutes is sufficient time for any idle connection.
	// 		trhttp2.ReadIdleTimeout = 5 * time.Minute
	// 		// PingTimeout is the timeout after which the connection will be closed
	// 		// if a response to Ping is not received.
	// 		trhttp2.PingTimeout = dialTimeout

const (
	// OpConnect is a connect request.
	OpConnect Op = iota + 1

	// OpConnectResponse is a response to a connect request.
	OpConnectResponse

	// OpPing is a ping request.
	// If a mux id is specified that mux is pinged.
	// Clients send ping requests.
	OpPing

	// OpPong is a OpPing response returned by the server.
	OpPong

	// OpConnectMux will connect a new mux with optional payload.
	OpConnectMux

	if err := target.init(); err != nil {
		return false, err
	}
	return target.isActive()
}

func (target *PostgreSQLTarget) isActive() (bool, error) {
	if err := target.db.Ping(); err != nil {
		if IsConnErr(err) {
			return false, store.ErrNotConnected
		}
		return false, err
	}
	return true, nil
}

	// 3) Returning, with ID, stream from list.
	//
	// If we don't have a list id we must ask the server if it has a cache or create a new.
	if o.ID != "" && !o.Transient {
		// Create or ping with handout...
		rpc := globalNotificationSys.restClientFromHash(pathJoin(o.Bucket, o.Prefix))
		var c *metacache
		if rpc == nil {
			resp := localMetacacheMgr.getBucket(ctx, o.Bucket).findCache(*o)
			c = &resp

			}
		case <-pingTimer:
			if time.Since(time.Unix(atomic.LoadInt64(&m.LastPong), 0)) > clientPingInterval*2 {
				m.addErrorNonBlockingClose(respHandler, ErrDisconnected)
				return
			}
			// Send new ping.
			gridLogIf(m.ctx, m.send(message{Op: OpPing, MuxID: m.MuxID}))
		}
	}
}

// responseCh is the channel to that goes to the requester.
// internalResp is the channel that comes from the server.

	NATSSubject       = "subject"
	NATSUsername      = "username"
	NATSPassword      = "password"
	NATSToken         = "token"
	NATSTLS           = "tls"
	NATSTLSSkipVerify = "tls_skip_verify"
	NATSPingInterval  = "ping_interval"
	NATSQueueDir      = "queue_dir"
	NATSQueueLimit    = "queue_limit"
	NATSCertAuthority = "cert_authority"
	NATSClientCert    = "client_cert"
	NATSClientKey     = "client_key"

		if peer == nil {
			continue
		}
		peer.Listen(ctx, mergeCh, values)
	}

	var (
		emptyEventTicker <-chan time.Time
		keepAliveTicker  <-chan time.Time
	)

	if p := values.Get("ping"); p != "" {
		pingInterval, err := strconv.Atoi(p)
		if err != nil {
			writeErrorResponse(ctx, w, errorCodes.ToAPIErr(ErrInvalidQueryParams), r.URL)
			return
		}
		if pingInterval < 1 {

			// Prefer local disks
			prefer[index] = disk.Hostname() == ""
		}

		written, err := erasure.Decode(ctx, writer, readers, partOffset, partLength, partSize, prefer)
		// Note: we should not be defer'ing the following closeBitrotReaders() call as
		// we are inside a for loop i.e if we use defer, we would accumulate a lot of open files by the time
		// we return from this function.
		closeBitrotReaders(readers)

	if m.outBlock == nil {
		// Closed
		return
	}
	select {
	case m.outBlock <- struct{}{}:
	default:
		gridLogIf(m.ctx, errors.New("output unblocked overflow"))
	}
}

func (m *muxServer) ping(seq uint32) pongMsg {
	if !m.checkSeq(seq) {
		msg := fmt.Sprintf("receive sequence number mismatch. want %d, got %d", m.RecvSeq, seq)
		return pongMsg{Err: &msg}
	}
	select {
	case <-m.ctx.Done():

tls                               (on|off)    set to 'on' to enable TLS
tls_skip_verify                   (on|off)    trust server TLS without verification, defaults to "on" (verify)
ping_interval                     (duration)  client ping commands interval in s,m,h,d. Disabled by default
streaming                         (on|off)    set to 'on', to use streaming NATS server