Fish Wang says to YSITD
var http = require('http'); var express = require('express'); var fs = require('fs') var router = express(); var server = http.createServer(router); router.get('/', function (req, res, next) {     res.set('ContentType', 'application/octet-stream');     res.set('Content-Disposition: attachment; filename="dummy_file"')     fs.createReadStream('/dev/urandom').pipe(res); }) server.listen(process.env.PORT || 8080, process.env.IP || "0.0.0.0", function(){     var addr = server.address();     console.log("Chat server listening at", addr.address + ":" + addr.port); });