simple download

download.js

var fs = require('fs');
var path = require('path');
var url = require('url');
var protocol = {
  https: require('https'),
  http: require('http')
};

function download(src, dest, cb) {
  var options = url.parse(src);
  options.agent = false;
  var request = protocol[options.protocol.replace(':', '')].request;
  var req = request(options, function(res) {
    if (res.statusCode === 200) {
      res.pipe(fs.createWriteStream(dest));
      cb();
    } else if (res.statusCode === 302) {
      if (res.headers.location) {
        download(res.headers.location, dest, cb);
      } else {
        cb('no location');
      }
    } else if (res.statusCode === 404) {
      cb(404);
    } else {
      cb(res.statusCode);
    }
  });
  req.on('error', function(err) {
    cb(err);
  });
  req.end();
}