httpServer.js

const http = require('http')
const url = require('url')

function httpServer() {
  const routes = {
    GET: {},
    POST: {},
    PUT: {},
    DELETE: {},
    PATCH: {},
  }
  const server = http.createServer((request, response) => {
    const parsedUrl = url.parse(request.url || '', true)
    const { pathname } = parsedUrl
    const query = {...parsedUrl.query}
    console.log({
      method: request.method,
      pathname,
      query,
      headers: request.headers,
    })
    const route = routes[request.method][pathname]
    if (!route) {
       response.
       return response.end('route not found')
    }
    return route(request, response)
  })
  return {
    get(route, callback) {
      routes.GET[route] = callback
    },
    post(route, callback) {
      routes.POST[route] = callback
    },
    put(route, callback) {
      routes.PUT[route] = callback
    },
    delete(route, callback) {
      routes.DELETE[route] = callback
    },
    patch(route, callback) {
      routes.PATCH[route] = callback
    },
    listen(port, callback) {
      return server.listen(port, () => callback({ port }))
    }
  }
}

const app = httpServer()

app.get('/', (request, response) => {
  return response.end('ok')
})

app.get('/users', (request, response) => {
  return response.end('\n')
})

app.listen(8080, ({ port }) => {
  console.log(`server listening on http://localhost:${port}`)
})