Cancel a POST request - actionscript-3

Question

I have an app that makes a request to a server to generate an audio file and the problem that I have is that if I send two distinct and consecutive requests, I can not cancel the first. I tried with .unload or .unloadAndStop but always gives me error.
Any suggestions?
elfich="sonido" + elfichnum;
var request:URLRequest = new URLRequest();
var variables:URLVariables = new URLVariables();
var loader:URLLoader = new URLLoader();
variables.text=caja_texto;
variables.fileName=elfich;
request.url = "http://192.168.0.19:800/cgi-bin/tts.cgi";
request.method = URLRequestMethod.POST;
request.data = variables;
loader = new URLLoader();
loader.dataFormat = URLLoaderDataFormat.BINARY;
loader.addEventListener(Event.COMPLETE, cargacompletanew);
loader.addEventListener(IOErrorEvent.IO_ERROR, onErrornew);
loader.load(request);
}
function cargacompletanew(event:Event):void
{
xlocalSound = new Sound();
var xreq:URLRequest = new URLRequest("http://192.168.0.19:800/output/" + elfich + ".mp3");
xlocalSound.load(xreq);
xlocalSound.addEventListener(Event.OPEN, iniciarSonido);
}

Answer 1

What about
loader.removeEventListener(Event.COMPLETE, cargacompletanew);
loader.removeEventListener(IOErrorEvent.IO_ERROR, onErrornew);
loader.close();
I think there was a problem with close() if you were trying to close it if nothing was loaded, so I'd try to put that inn try/catch block.
try
{
loader.close();
}
catch(e:Error)
{
loader("Oh noes!");
}