js 获取请求headers

fetch('https://api.example.com/data')
  .then(response => {
    // 获取所有的响应头
    const headers = response.headers;
    // 获取特定的响应头
    const contentType = response.headers.get('content-type');
    console.log(contentType);
  })
  .catch(error => console.error('Error:', error));

const http = require('http');

http.createServer((req, res) => {
  // 获取请求头
  const headers = req.headers;
  console.log(headers);

  res.end('Hello World\n');
}).listen(8080);

const express = require('express');
const app = express();

app.get('/', (req, res) => {
  // 获取特定的请求头
  const userAgent = req.get('user-agent');
  console.log(userAgent);
  res.send('Hello World!');
});

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

const express = require('express');
const cors = require('cors');
const app = express();

app.use(cors({
  origin: 'https://example.com',
  methods: ['GET', 'POST'],
  allowedHeaders: ['Content-Type', 'Authorization']
}));

app.get('/', (req, res) => {
  res.send('Hello World!');
});

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