Two ways to call an HTTP service using the send() method with a parameter

          
<?xml version="1.0"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml">
  <mx:Script>
    
    public function callService():void {
      myService.cancel();
      var params:Object = new Object();
      params.param1 = 'val1';
      myService.send(params);
    }
  </mx:Script>
  <mx:HTTPService id="myService" destination="Dest" useProxy="true" />
  <mx:Button click="myService.send({param1: 'val1'});" />
  <mx:Button click="callService();" />
</mx:Application>

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Two ways to call an HTTP service using the send() method with a parameter : HTTPService « Data Model « Flex

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