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>