How to test if a URL is valid in Actionscript 3.0?

HY, everyone!
I'm trying to make a function that tests whether a URL is valid and returns true if it is, false otherwise, so that I can use it in a statement "if".



The I try to do is using two event listeners for the property "contentLoaderInfo' of a charger: one for Event.OPEN (if this event is dispatched, so I know that the URL is valid) and one for IOErrorEvent.IO_ERROR (if this event is dispatched, so I know that the URL is not valid).
But the problem is that by using event handler functions, I leave the main Tester URL function and am unable to return a value from it. The way I thought to get around this was to set a variable for returnValue, which the return value of both the event handler works and then just go "return returnValue; But I do not know how to return a value from a function handler events, and even if I did I still couldn't do it this way, because it takes time to send events and the variable 'returnValue' would be undefined at the point where I try to return it.
I hope you understood what I tried to explain above. Here is some code to illustrate this better (it is not valid, that it's just so that you understand my problem):

private void testUrl(url:String):void {}
var returnValue:Boolean;
var loader: Loader = new Loader();
returnValue = loader.contentLoaderInfo.addEventListener (Event.OPEN, onGoodUrl);
It is a global variable which I assigned the value of "loader" so that I can farm onGoodUrl
_testLoader = loader;
returnValue = loader.contentLoaderInfo.addEventListener (IOErrorEvent.IO_ERROR, onBadUrl);
Loader.Load (new URLRequest (url));
Even if I knew how to do an event handler that returns a value, I still have to wait for loading to start, and I couldn't return the value here:
return returnValue;
}

private void onGoodUrl(event:Event):Boolean {}
_testLoader.close ();
// ???
Returns true;
}

private void onBadUrl(event:IOErrorEvent):Boolean {}
// ???
Returns false;
}



You know a way around this problem? Or, for that matter, you know another way to test a valid URL?

Thank you for your time!

You should test the httpStatus of the URLLoader. Streaming content is undergoing a specific process at entry into Flash. The only problem with httpStatus, is that it does not work for all browsers, especially systems based on Linux and any programs on the evolutionary food chain. I didn't have problems with IE or NS/FF on Vista at this stage.

1. send the request

2. receive the HTTP (HTTPStatusEvent.HTTP_STATUS) status

3A. good condition - Begin Load (Event.OPEN)
3 b. bad condition - 404 or protected classified (IOErrorEvent.IO_ERROR)

4 receive files - download (ProgressEvent.PROGRESS)

5 DOWNLOAD Complete (Event.COMPLETE)

Tags: Adobe Animate

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