server.js

const http = require('http');
const port = 5000;
const fetch = require('node-fetch');

const requestHandler = (request, response) => {
	fetch('http://localhost:3000/').then(r => r.text()).then(text => {
	//	console.log(text);
		response.end(text);
	});
}

const server = http.createServer(requestHandler)

server.listen(port, (err) => {
  if (err) {
    return console.log('something bad happened', err)
  }

  console.log(`server is listening on ${port}`)
})

slow-api.js

const http = require('http');
const port = 3000;

let i = 0;

const requestHandler = (request, response) => {
	let j = i++;
	setTimeout(function() {
		response.end("" + j);
	}, 1000);
}

const server = http.createServer(requestHandler)

server.listen(port, (err) => {
  if (err) {
    return console.log('something bad happened', err)
  }

  console.log(`server is listening on ${port}`)
})