node add header to preflight request code example

Example 1: express js cors

var express = require('express')
var cors = require('cors')  //use this
var app = express()

app.use(cors()) //and this

app.get('/user/:id', function (req, res, next) {
  res.json({user: 'CORS enabled'})
})

app.listen(5000, function () {
  console.log('CORS-enabled web server listening on port 5000')
})

Example 2: express get request origin

app.use((req, res, next) => {
  const host = req.get('host');
  const origin = req.get('origin');
});