HTTPService fail to send parameters

Flash Builder 4.5

Flash Player 10.3

Windows 7 pro 64 bit

problem,

I'm sending an object as http parameters, but it never arrive to the web server.

help welcomed.

more info,

flash builder network monito shows that the http request include the parameters.

wireshark capture shows that there are no parameters in the http request.

source code

    <fx:Script>

        <![CDATA[

            import com.adobe.serialization.json.JSON;

            import com.adobe.serializers.json.JSONEncoder;   

            import mx.rpc.events.FaultEvent;

            import mx.rpc.events.ResultEvent;

            import mx.rpc.http.HTTPService;

            protected function button1_clickHandler(event:MouseEvent):void

            {

                var streamParams:Object = new Object;

                streamParams.title = "demostration";

                streamParams.quality = 1;               

                vidictionService.contentType="application/json";

                vidictionService.send(streamParams);           

            }

            protected function httpResultHandler(evt:ResultEvent):void

            {

                trace("InitView.httpResultHandler()" + evt.result.toString());

                navigator.pushView(views.MobileLiveHomeView,{streamParams:evt.result});

            }

            protected function httpFaultHandler(evt:FaultEvent):void

            {

                trace("InitView.httpFaultHandler()" + evt.toString());           

            }       

        ]]>

    </fx:Script>

    <fx:Declarations>

        <s:HTTPService id="vidictionService"

                       url="http://192.168.2.104:9000/streams/save"

                       fault="httpFaultHandler(event)"

                       result="httpResultHandler(event)"

                       resultFormat="object"

                       showBusyCursor="true"/>

    </fx:Declarations>

    <s:Button bottom="10" label="Publish" click="button1_clickHandler(event)" horizontalCenter="0"/>