Send response chunk by chunk

router.get('/testFile', function (req, res) {
  request.get({url: authEndpoint, headers: {"X-Auth-Key": apiKey, "X-Auth-User": user}}, function (err, res1) {
    var data = JSON.parse(res1.body);
    var objectPath = data.storage.public + '/' + container + '/' + filename;
    request.get({
      url: objectPath,
      headers: {"X-Auth-Token": res1.headers['x-auth-token']}
    }, function (err, res2,body) {
      if (err) {
        console.log('error', err);
      } else {
        res.writeHead(206, {
          //Content-Range?
          "Accept-Ranges": "bytes",
          "Content-Length": 2048,
          "Content-Type": "video/mp4"
        });

        var bodyStream = new streambuffers.ReadableStreamBuffer({
          frequency: 10,
          chunkSize: 2048
        });
        bodyStream.put(body);

        bodyStream.on('data',function() {
          console.log("writing data");
          bodyStream.pipe(res);
        });
      }
    });
  });
});