express js provides api code example
Example 1: node.js express
const express = require('express')
const app = express()
const port = 3000
app.get('/', (req, res) => res.send('Hello World!'))
app.listen(port, () => console.log(`Example app listening at http://localhost:${port}`))
Example 2: http header express
app.get('/', (req, res) => {
req.header('User-Agent')
})
// Use the Request.header() method to access
//one individual request header’s value