flex:HTTPService

<mx:HTTPService
concurrency="multiple|single|last"
contentType="application/x-www-form-urlencoded|application/xml"
destination="DefaultHTTP"
id="No default."
method="GET|POST|HEAD|OPTIONS|PUT|TRACE|DELETE"
resultFormat="object|array|xml|e4x|flashvars|text"
showBusyCursor="false|true"
makeObjectsBindable="false|true"
url="No default."
useProxy="false|true"
xmlEncode="No default."
xmlDecode="No default."
  Events
fault="No default."
result="No default."
/>
demo:
<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute"
xmlns="*" creationComplete="send_data()">
    <mx:Script>
        <![CDATA[
            private function send_data():void {
                userRequest.send();
            }
        ]]>
    </mx:Script>
    <mx:Form x="22" y="10" width="493">
        <mx:HBox>
            <mx:Label text="Username"/>
            <mx:TextInput id="username"/>
        </mx:HBox>
        <mx:HBox>
            <mx:Label text="Email Address"/>
            <mx:TextInput id="emailaddress"/>
        </mx:HBox>
        <mx:Button label="Submit" click="send_data()"/>
    </mx:Form>
    <mx:DataGrid id="dgUserRequest" x="22" y="128" dataProvider="{userRequest.lastResult.users.user}">
        <mx:columns>
            <mx:DataGridColumn headerText="User ID" dataField="userid"/>
            <mx:DataGridColumn headerText="User Name" dataField="username"/>
        </mx:columns>
    </mx:DataGrid>
    <mx:TextInput x="22" y="292" id="selectedemailaddress"
        text="{dgUserRequest.selectedItem.emailaddress}"/>
    <mx:HTTPService id="userRequest" url="http://localhost/myproj/request_post2.php" useProxy="false" method="POST">
        <mx:request xmlns="">
            <username>{username.text}</username>
            <emailaddress>{emailaddress.text}</emailaddress>
        </mx:request>
    </mx:HTTPService>
</mx:Application>