NSURLConnection finished with error - code -1005
Response failed, error buffer: The network connection was lost.
How to handle intermittent network outages on iOS
Also, you can not receive an error callback from the downloader.
If you have a solution, please help.
Thank you. 
var downloader = new jsb.Downloader ();
downloader.setOnFileTaskSuccess(function(){
});
downloader.setOnTaskError(function(){
console.log("error");
});
downloader.createDownloadFileTask(url, fullPath);
cocos creator 1.9.1