如何在node.js中添加标头

const http = require('http');

const server = http.createServer((req, res) => {
  // 在这里添加标头
});

res.setHeader('HeaderName', 'HeaderValue');

res.setHeader('Content-Type', 'text/plain');

res.end('Response body');

const http = require('http');

const server = http.createServer((req, res) => {
  res.setHeader('Content-Type', 'text/plain');
  res.end('Hello, World!');
});

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