Deal connection lost in ActionScript 3 - json

Question

I have this code:
public function Json2Me(_urlJSON:String) {
var loader:URLLoader = new URLLoader();
var request:URLRequest = new URLRequest();
request.url = _urlJSON;
loader.addEventListener(Event.COMPLETE, onLoaderComplete);
loader.addEventListener(IOErrorEvent.IO_ERROR,informadorIO);
loader.load(request);
}
private function onLoaderComplete(e:Event):void{
var loader:URLLoader = URLLoader(e.target);
JSONEnviado = com.adobe.serialization.json.JSON.decode(loader.data);
dispatchEvent(new Event("LanzaJSON"));
}
public function informadorIO(e:Event):void{
trace(e);
}
I need to protect my code against connection lost, so what I have to do to keep my project running?

Answer 1

You can catch the IO errors on url loader:
loader.addEventListener(IOErrorEvent.IO_ERROR, ioErrorHandler);
private function ioErrorHandler(event:IOErrorEvent):void {
// URLLoader io failed
trace("ioErrorHandler: " + event);
// retry Json2Me maybe? How many times before you fail completely? Notify user?
Json2Me("https://someurl.com/xxxxx")
}
Also the uncaughtErrorEvents on the Loader/LoaderInfo can catch things like not even having a network connection.
LoaderInfo.uncaughtErrorEvents: to detect uncaught errors in code
defined in the same SWF. Loader.uncaughtErrorEvents: to detect
uncaught errors in code defined in the SWF loaded by a Loader object.
Example:
loaderInfo.uncaughtErrorEvents.addEventListener(UncaughtErrorEvent.UNCAUGHT_ERROR, onUncaughtError);
private function onUncaughtError(e:UncaughtErrorEvent):void {
e.preventDefault();
trace("onUncaughtError!!! - " + e.toString());
// Notify user of failure?...
}

Answer 2

You can also use a HTTPStatusEvent which can give use the returned HTTP status ( or even the returned HTTP response headers for an AIR app ) :
var url_loader:URLLoader = new URLLoader()
url_loader.addEventListener(HTTPStatusEvent.HTTP_RESPONSE_STATUS, on_http_status); // works only for AIR
url_loader.addEventListener(HTTPStatusEvent.HTTP_STATUS, on_http_status);
url_loader.load(new URLRequest('http://www.example.com'))
function on_http_status(e:HTTPStatusEvent): void
{
trace(e.type); // gives, for example : httpStatus
trace(e.status); // gives, for example : 200
}
Hope that can help.