HTTP Request - Returning HTML Format

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HTML5

Hi,

While trying to Display "xmlhttp.responseText" Its returning HTML PAge. I want string data to be displayed.
PLease help
My code :

(window.XMLHttpRequest)
    {
        xmlhttp = new XMLHttpRequest();
    }
    else
    {
        xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
    }

    xmlhttp.onreadystatechange = function () {
       
        if (xmlhttp.readyState == 4 && xmlhttp.status == 200) {

             alert(xmlhttp.responseText); //This is showing Result as HTML PAGE
            var response = eval('(' + xmlhttp.responseText + ')');
            
            var status = " ";
            if (response.Data.length != 0) {
                
                for (var i = 0; i < response.Data.length; i++) {

                    for (var value in response.Data[i]) {
                        status = status + "<option value=" + response.Data[i][value] + ">" + response.Data[i][value] + "</option>";
                    }

                }
            }
            else {
                
            }
            $("#ddItem").html(status);
            $("select#ddItem").selectmenu("refresh");
            
           
        }

        else if (xmlhttp.status != 200) {

            navigator.notification.alert("Coudn't connect to the server,Please check your internet settings or contact system administrator!", null, 'Connection Failed', 'OK');
        }
    }

    var key = window.localStorage.getItem("userkey");
    var clientid = window.localStorage.getItem("clientid");
    var url = clientid + "/GetInventory";
    xmlhttp.open("POST", url, true);
    xmlhttp.timeout = 10000;
    xmlhttp.ontimeout = function () { $.mobile.loading("hide"); navigator.notification.alert("Coudn't connect to the server,Please check your internet settings or contact system administrator!", null, 'Timed Out', 'OK'); }
    xmlhttp.send("key=" + key);