aws knox upload from url / set expiring url

gistfile1.txt

var filename = "/imagename.jpg";
var url = "http://imageurl.jpg";
http.get(url , function(res){
  var headers = {
      'Content-Length': res.headers['content-length']
    , 'Content-Type': res.headers['content-type']
  };
  client.putStream(res, filename, headers, function(err, res){
        var expires = new Date();
        expires.setMinutes(expires.getMinutes() + 10);
        var url =  client.signedUrl(filename, expires);
        console.log(url);
  });
});