const HttpRequest = function() {  this.query = ''}function HttpResponse() {  this.body = []  this.status = 0;}HttpResponse.prototype.write = function(block) {  this.body.push(block)}HttpResponse.prototype.display = function() {  console.log(this.body, this.status)}const HttpApplication = function() {  this.caches = []}HttpApplication.prototype.use = function(middleware) {  this.caches.push(middleware)}HttpApplication.prototype._createPipeLineItem = (fn, next) => {  return (req, rsp) => {    fn.call(this, req, rsp, next)  }}HttpApplication.prototype.applyRequest = function(req, rsp) {  const middleware = this.caches.map(item => item).reverse()  let lastHandler = (req, rsp) => {    rsp.write('404')    rsp.status = 404  }  for (let index = 0; index < middleware.length; index++) {    const element = middleware[index];    lastHandler = this._createPipeLineItem(element, lastHandler)  }  lastHandler(req, rsp)}const app = new HttpApplication()app.use((req, rsp, next) => {  rsp.write('first middleware')  next(req, rsp)  rsp.write('first middleware end')})app.use((req, rsp, next) => {  rsp.write('second middleware')  rsp.status = 200  // next(req, rsp)})const req = new HttpRequest()const rsp = new HttpResponse()app.applyRequest(req, rsp)rsp.display()