TCP socket connection Flex 3 - funny square returned.

i'm busy fiddling around with flex as I've decided to do my next project in flex - just for fun.
i found some code on how to connect to a TCP socket .

it returns values like this
<?xml version="1.0"?>

<Msg xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">

  <ACK fromSystem="blah" msgType="Connect" />

</Msg> <--- it has a square at the end of it. you can't really see it here
anyone have any idea why its doing that and what i have to do to get rid of it?

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute">
<mx:Script>
	<![CDATA[
		private var socket:Socket = new Socket();
 
		private function load():void{
			socket.connect('127.0.0.1', 8080);
        	socket.addEventListener(Event.CONNECT, connectedHandler);
			socket.addEventListener(ProgressEvent.SOCKET_DATA, inputDataHandler);
		}
		
	    private function inputDataHandler(event:ProgressEvent):void {
			var bytesLoaded:int = socket.bytesAvailable;
			var str:String = socket.readUTFBytes(socket.bytesAvailable);
			myT.text+=str;
	    }
 
    	private function connectedHandler(event:Event):void {
        	socket.writeUTFBytes("GET /sockets.html HTTP/1.0\n\n");
        	socket.flush();
	    }
	]]>
	</mx:Script>	
 
	<mx:Button click="load()" label="load"/>
	<mx:TextArea x="10" y="30" width="680" height="395" id="myT"/>
</mx:Application>

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sample.bmp