index.js

const express = require('express')
const request = require('request')

// APP 1 (the proxy server)

const app1 = express()

app.use('/proxy', (req, res) => {
  let target = req.url.replace('/', 'http://')
  req.pipe(request(target)).pipe(res)
})

app1.listen(3000, () => console.log('app1: localhost:3000'))


// APP 2 (the target server)

const app2 = express()

app2.all('/*', (req, res) => {
  console.log('received thing', req.url)
  res.send('Server Online')
})

app2.listen(3020, () => console.log('app2: localhost:3020'))

instructions.md

The script creates two servers, one on localhost:3000 and another on port 3020.

You can use app1 to proxy a request to app2 (or any other server):

curl localhost:3000/proxy/localhost:3020/health

The app2 is just for example purposes. You should be able to proxy requests to anywhere:

curl http://localhost:3000/proxy/jsonplaceholder.typicode.com/posts