async.js – download multiple files from multiple urls to first success

var async = require('async');
var files = ['file1','file2','file3'];
var urls = ['url1','url2','url3'];
var down = function(url, file, callback) {
		var r = Math.random() >= 0.5;
		console.log('--- end '+file+', '+url+', '+r);
	}, 1000);
async.concat(files, function(file, callback){
	async.someSeries(urls, function(url, callback1){
		down(url, file, function(isOk){
			callback1(null, isOk);
	}, function(err, r){
		callback(err, r);
}, function(err, fullRes){
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