How to check data exchange

Hi all

I want to check data exchange between Client(IE Mobile, HTML,JScript) and Server (ASP.NET).

My client is the following
<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
     <title>Simple XMLHttpRequest page</title>
     <script type="text/javascript">
         var xmlHttp;
         function createXMLHttpRequest()
         {
             if (window.ActiveXObject)
     &n ...