var express = require(‘express‘);var fs = require(‘fs‘)var path= require(‘path‘);var cors = require(‘cors‘);var app = express();app.use(cors());  var options = {  dotfiles: ‘ignore‘,  etag: false,  extensions: [‘htm‘, ‘html‘],  index: false,  maxAge: ‘1d‘,  redirect: false,  setHeaders: function (res, path, stat) {    res.set(‘x-timestamp‘, Date.now())  }}app.use(express.static(‘public‘, options));app.get(‘/download‘,function(req, res, next){    var currDir = path.normalize(req.query.dir),        fileName = req.query.name,        currFile = path.join(currDir,fileName),        fReadStream;        console.log(currDir );        console.log(fileName );    fs.exists(currFile,function(exist) {        if(exist){            res.set({                "Content-type":"application/octet-stream",                "Content-Disposition":"attachment;filename="+encodeURI(fileName)            });            fReadStream = fs.createReadStream(currFile);            fReadStream.on("data",function(chunk){res.write(chunk,"binary")});            fReadStream.on("end",function () {                res.end();            });        }else{            res.set("Content-type","text/html");            res.send("file not exist!");            res.end();        }    });});app.listen(8088, function(){        console.log(‘localhsot:8080‘)});