Check broken links

Question

I have an application that shows through a DataGrid component, table fields, for this is using a HTTPService, which has a field that is a link to a document. Pdf.
The count is over 2000 of whichsome are available and others not. To get access to files that are not shown in the link generated an error like this "Not Found The requested URL / file/Res018_99.pdf was not found on this server."
I wish I could control the message and therefore to generate your own.
Thanks!!!!

Answer 1

I can not catch the error, which may be the problem.
This is my source code:
<?xml version="1.0" encoding="utf-8"?>
<mx:Label xmlns:mx="http://www.adobe.com/2006/mxml" text="{data.NUMERO}"
     click="linkListener(event)" mouseOver="mouseOver(event)"
     mouseOut="mouseOut(event)">
     <mx:Script>
          <![CDATA[
          import flash.errors.IOError;
             import mx.controls.Alert;
          private function mouseOver(event:MouseEvent):void {
             event.currentTarget.setStyle("color","0x0000FF");
             event.currentTarget.setStyle("textDecoration","underline");
          private function mouseOut(event:MouseEvent):void {
             event.currentTarget.setStyle("color","0x000000");
             event.currentTarget.setStyle("textDecoration","none");
          private function linkListener(event:MouseEvent):void {
          try
             var request:URLRequest = new URLRequest(event.currentTarget.data.UBICACION_ARCHIVO);
             navigateToURL(request, "_blank");
                catch (error:IOError)
                  trace("message!!!!!!!!!");
          ]]>
     </mx:Script>
</mx:Label>
Thankssss!!!!!!!!