This is a simple HTTP server which gives you predictable HTTP responses based on the URL. It's super simple. This requires `lodash`.

rest-server-for-tests.js

'use strict'

const http = require('http')
const _ = require('lodash')

// Create an HTTP tunneling proxy
var svr = http.createServer( (req, res) => {

  // Just some simple handler routines
  const handlers = _.merge(
    { '/success': { status: 200, message: 'OK' }, },
    ...[500, 404, 422, 409, 504, 503, 502, 403].map(
      x => ({[`/${x}`]: { status: x, message: `Ack: ${x}` }})
    ),
    { '/timeout': { status: null, message: null } }
  )

  console.info(req.url)
  // Use a handler based on the URL, or default to success
  let handler = handlers[ req.url || '/success' ] || handlers['/success']

  if ( ! handler.status ) {
    console.info('Timing out on purpose')
    req.socket.setTimeout(500)
    return
  }

  res.writeHead(handler.status, {'Content-Type': 'text/plain'});
  return res.end(handler.message)
});

svr.listen(6006, 'localhost')