在访问本地主机3000时，我得到了在使用 Postman 之前无法获得/。
在postman中发送POST请求到本地主机的过程中，我的程序失败，并出现此错误
'节点：内部/进程/承诺：288触发未捕获异常（错误，真/* 来自承诺 */）;^
错误：在TCP连接环绕器上连接ECONREFUSED：：1：5672。连接后[作为完成时]（节点：网络：1487：16）{错误号：-61，代码：'ECONNREFUSED'，系统调用：“连接”，地址：“：：1”，端口：小行星5672

config.js
----------

module.exports = {
  rabbitMQ: {
    url: "amqp://localhost",
    exchangeName: "logExchange",
  },
};

Producer.js
-----------

const amqp = require("amqplib");
const config = require("./config");

//step 1 : Connect to the rabbitmq server
//step 2 : Create a new channel on that connection
//step 3 : Create the exchange
//step 4 : Publish the message to the exchange with a routing key

class Producer {
  channel;

  async createChannel() {
    const connection = await amqp.connect(config.rabbitMQ.url);
    this.channel = await connection.createChannel();
  }

  async publishMessage(routingKey, message) {
    if (!this.channel) {
      await this.createChannel();
    }

    const exchangeName = config.rabbitMQ.exchangeName;
    await this.channel.assertExchange(exchangeName, "direct");

    const logDetails = {
      logType: routingKey,
      message: message,
      dateTime: new Date(),
    };
    await this.channel.publish(
      exchangeName,
      routingKey,
      Buffer.from(JSON.stringify(logDetails))
    );

    console.log(
      `The new ${routingKey} log is sent to exchange ${exchangeName}`
    );
  }
}

module.exports = Producer;



Server.js
----------

`const express = require("express");
const bodyParser = require("body-parser");
const app = express();
const Producer = require("./producer");
const producer = new Producer();

app.use(bodyParser.json("application/json"));

app.post("/sendLog", async (req, res, next) => {
  await producer.publishMessage(req.body.logType, req.body.message);
  res.send();
});

app.listen(3000, () => {
  console.log("Server started...");
});`

我是一个初级实习生广告是沿着一个youtube视频由https://www.youtube.com/watch?v=igaVS0S1hA4由Computerix，以帮助我理解的概念
我尝试重新启动rabbitMQ和express服务器并在不同的端口上运行它，但没有解决问题