NodeJs中post函数内部的函数如何响应？

const http = require('http');

http.createServer((req, res) => {
  if (req.method === 'POST') {
    let body = '';
    req.on('data', (chunk) => {
      body += chunk;
    });
    req.on('end', () => {
      // 处理POST请求的数据
      const postData = JSON.parse(body);
      // 调用回调函数进行响应
      handlePostRequest(postData, (response) => {
        res.writeHead(200, { 'Content-Type': 'application/json' });
        res.end(JSON.stringify(response));
      });
    });
  }
}).listen(3000);

function handlePostRequest(data, callback) {
  // 处理POST请求的逻辑
  // ...
  // 调用回调函数返回响应数据
  callback({ message: 'Success' });
}

const http = require('http');

http.createServer((req, res) => {
  if (req.method === 'POST') {
    let body = '';
    req.on('data', (chunk) => {
      body += chunk;
    });
    req.on('end', () => {
      // 处理POST请求的数据
      const postData = JSON.parse(body);
      // 调用Promise对象进行响应
      handlePostRequest(postData)
        .then((response) => {
          res.writeHead(200, { 'Content-Type': 'application/json' });
          res.end(JSON.stringify(response));
        })
        .catch((error) => {
          res.writeHead(500, { 'Content-Type': 'application/json' });
          res.end(JSON.stringify({ error: error.message }));
        });
    });
  }
}).listen(3000);

function handlePostRequest(data) {
  return new Promise((resolve, reject) => {
    // 处理POST请求的逻辑
    // ...
    // 返回响应数据或错误信息
    resolve({ message: 'Success' });
  });
}