proxy.js

var http = require('ringo/httpclient');
var {AsyncResponse} = require('ringo/webapp/async');

var app = exports.app = require('stick').Application()
        .configure('error', 'notfound', 'route', 'params');

app.get('/proxy/*', function (req, path) {
    var response = new AsyncResponse(req);

    // Fetch MP3 from AWS S3.
    http.request({
        url: 'http://s3.amazonaws.com/acme/' + path + '?' + req.queryString,
        async: true,
        binary: true,
        part: function (bytes) {
            response.write(bytes).flush();
        },
        complete: function () {
            response.close();
        }
    });

    return response.start(200, {'Content-Type': 'audio/mpeg'});
});

if (require.main === module) {
    require('stick/server').main(module.id);
}