无法在谷歌浏览器上使用XMLHttpRequest加载动态生成的XML

我有一个生成XML输出的aspx文件。在另一页上，我尝试使用 XMLHttpRequest open 方法来读取从 aspx 文件输出的 XML。FF，IE，Safari似乎都可以工作，除了Chrome。但是在 chrome 上，如果我直接转到地址栏上的 aspx 页面，则 xml 会按预期生成。任何帮助，不胜感激。

下面是 aspx 代码：

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="ProviderFinderXML.aspx.cs" Inherits="Pages_ProviderFinderXML" %>
<%@ OutputCache Duration="6" VaryByParam="Type" %>

Aspx 代码隐藏：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Xml;
using System.ServiceModel.Syndication;
using System.Text;
using System.Data;
public partial class Pages_ProviderFinderXML : System.Web.UI.Page
{    
    protected string appPath = Helper.GetApplicationPath();
    private DataTable dataTable, dataTable2;
    private Helper helper = new Helper();
    protected void Page_Load(object sender, EventArgs e)
    {
    }

    protected override void OnInit(EventArgs e)
    {
        float center_lat = 0, center_lng = 0;
        int radius = 0;
        if (Request.QueryString["lat"] != null)
            center_lat = Common.ConvertToFloat(Request.QueryString["lat"].ToString());
        if (Request.QueryString["lng"] != null)
            center_lng = Common.ConvertToFloat(Request.QueryString["lng"].ToString());
        if (Request.QueryString["radius"] != null)
            radius = Common.ConvertToInt(Request.QueryString["radius"].ToString());
        int categoryId = 0;
        if (Request.QueryString["categoryId"] != null)
            categoryId = Common.ConvertToInt(Request.QueryString["categoryId"].ToString());
        Response.Buffer = false;
        Response.Clear();
        Response.ContentType = "application/xml";
        XmlTextWriter xmlWriter = new XmlTextWriter(Response.Output);
        xmlWriter.WriteStartDocument();
        xmlWriter.WriteStartElement("markers");
        int perPage = 0, currentPage = 1;
        dataTable = helper.DIR_GetNearbyDirectoryMembersByLatLng(center_lat, center_lng, radius, categoryId, perPage, currentPage);
        if (dataTable.Select().Length > 0)
        {
            xmlWriter.WriteAttributeString("title", cRow["title"].ToString().Replace("'", "'''"));
        }
        xmlWriter.WriteEndDocument();
        xmlWriter.Flush();
        xmlWriter.Close();
        base.OnInit(e);
        Response.Close();
    }

    private string GetFullyQualifiedUrl(string url)
    {
        return string.Concat(Request.Url.GetLeftPart(UriPartial.Authority), ResolveUrl(url));
    }
}

下面是调用该 aspx 页的测试页代码部分：

<script type="text/javascript">
            $(document).ready(function () {
                searchLocationsNear();
            });
            function searchLocationsNear() {
                var searchUrl = 'http://localhost/integrativediagnosis2/Pages/ProviderFinderXML.aspx?lat=42.3584308&lng=-71.0597732&radius=20';
                var xmlhttp;
                if (window.XMLHttpRequest) {// code for IE7+, Firefox, Chrome, Opera, Safari
                    xmlhttp = new XMLHttpRequest();
                }
                else {// code for IE6, IE5
                    xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
                }
                xmlhttp.open("GET", "ProviderFinderXML.aspx?lat=42.3584308&lng=-71.0597732&radius=20", false);
                xmlhttp.send();
            }
        </script>