无法在node.js上接收正文数据

const http = require('http');

const server = http.createServer((req, res) => {
  let body = '';
  
  req.on('data', (chunk) => {
    body += chunk;
  });
  
  req.on('end', () => {
    // 在这里可以处理接收到的正文数据
    console.log(body);
    
    res.statusCode = 200;
    res.setHeader('Content-Type', 'text/plain');
    res.end('Data received successfully');
  });
});

server.listen(3000, () => {
  console.log('Server is running on port 3000');
});