Stream/proxy/pipe an mp3 file using express node.js web app framework.

node-express-stream-mp3

var
  _ = require('underscore'),
  https = require('https'),
  express = require('express'),
  app = express()
;

app.get('/audioFile.mp3', function(req, res) {
  https.get('https://example.com/any-mp3-file.mp3', function(audioFile) {
    res.set(_.extend(_.pick(audioFile.headers, 'accept-ranges', 'content-type', 'content-length'), { 'Access-Control-Allow-Origin': '*' }));
    audioFile.pipe(res);
  }).on('error', function(err) {
    console.error(err);
  }).end();
});

var server = app.listen(3000, function () {
  console.log('app listening on port %s', server.address().port);
});