RabbitMQ StompJs recieving just one Message - rabbitmq

Question

I'm trying to recieve a Message from the RabbitMq-Que with the Stomp-plugin. This works fine but the Problem is that I get every Message from the Queue. So if the Queue has 13 Messages, I get 13. The Key is that I just want to get 1 Message and after sending Ack or Nack the next one. Do somebody got any Idea how to get only one Message? Thanks for Help.
Here the code I got:
GetMessage()
{
this.GetRabbitMqClient().then((client)=>
{
var headers ={ack:'client', 'x-max-priority': '10'};
var subscription = client.subscribe("/queue/TestQue",this.messageCallback,headers);
});
}
private messageCallback = function(Message :IMessage)
{
console.log(Message.body);
setTimeout(()=> {Message.ack();},100000000000000);
}
private GetRabbitMqClient( ):Promise<Client> {
var promise = new Promise<Client>((resolve,reject)=>{
var client = new Client(
{
brokerURL: "ws://localhost:15674/ws",
connectHeaders:
{
login: "guest",
passcode: "guest"
},
// debug: function (str) {
// console.log(str);
// },
reconnectDelay: 5000,
heartbeatIncoming: 4000,
heartbeatOutgoing: 4000
});
client.onConnect = function (frame) {
resolve(client);
};
client.onStompError = function (frame) {
// Will be invoked in case of error encountered at Broker
// Bad login/passcode typically will cause an error
// Complaint brokers will set `message` header with a brief message. Body may contain details.
// Compliant brokers will terminate the connection after any error
reject(frame);
console.log('Broker reported error: ' + frame.headers['message']);
console.log('Additional details: ' + frame.body);
};
client.activate();
});
return promise;
}

Answer 1

I found the solution:
you just need to set in the headers the attribute:
'prefetch-count':'1'