restful service in javascriotp doesn't work

i have restful webService and I want to call websrevice using javaScript , So when i tried with xml file like var url = "xx.xml"; it success


<%@ Page Language="VB" AutoEventWireup="false" CodeFile="Default3.aspx.vb" Inherits="Default3" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://ift.tt/kkyg93">

<html xmlns="http://ift.tt/lH0Osb">
<head runat="server">
    <title></title>
 <script language="javascript">
     var xmlhttp;
     function init() {
         xmlhttp = new XMLHttpRequest();
     }
     function getdetails() {
       var url = "xx.xml";
          init();
          xmlhttp.open('GET', url, true);
         xmlhttp.send(null);
         xmlhttp.onreadystatechange = function () {
           alert(xmlhttp.readyState);
             alert(xmlhttp.status);

             if (xmlhttp.readyState == 4) {
                 if (xmlhttp.status == 200) {
                     var det = xmlhttp.responseText;           
                     alert(det);
                    
                 }
                 else
                     alert("Error ->" + xmlhttp.responseText);
             }
         };
     }

     getdetails();
</script>
</head>
<body>

    <form id="form1" runat="server">
    <div>
    
    </div>
    </form>
</body>
</html>

but when I use url of webservice like

var url = "http://localhost:3085/BasicService.svc/sess_details?session=1000"; it doesn't work . the value of xmlhttp.status is 0

remark when I put url in browser the information appear in xml style such as xx.xml file .

restful service in javascriotp doesn't work

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