HttpWebRequest HttpResponseHeader.location 的问题

songhuan 2008-09-18 01:05:50

HTTP/1.1 302 Moved Temporarily
Server: Apache-Coyote/1.1
ETag: 3cbvw6kgk9qlshgr
Location: http://www.ziprealty.com/global/searching.jsp?cKey=fs3swq26&target=http%3A%2F%2Fwww.ziprealty.com%2Fbuy_a_home%2Flogged_in%2Fsearch%2Fresults%2Findex.jsp%3FcKey%3Dz0m1vmcv%26page%3D1%26msg%3D
Content-Type: text/html;charset=utf-8
Content-Language: en
Content-Length: 0
Vary: Accept-Encoding
Expires: Thu, 18 Sep 2008 03:02:03 GMT
Cache-Control: max-age=0, no-cache, no-store
Pragma: no-cache
Date: Thu, 18 Sep 2008 03:02:03 GMT
Connection: keep-alive
Set-Cookie: NSC_qspevdujpoIUUQ=445235593660;expires=Thu, 18-Sep-08 03:02:51 GMT;path=/

上面是使用IE手动提交后返回的头，本人使用如下代码希望得到红的部分的Location，不知为何为空，请各位指教.

 Dim request As HttpWebRequest = CType(WebRequest.Create(surl1), HttpWebRequest)

        request.CookieContainer = mySaveCookieContainer

        request.Timeout = 100000000

        'request.AllowAutoRedirect = True

        Dim byteArray As Byte() = Encoding.UTF8.GetBytes(PostData)

        request.Method = "POST"

        request.ContentType = "application/x-www-form-urlencoded"

        request.ContentLength = byteArray.Length



            'post

        Dim newStream As Stream = request.GetRequestStream()

        newStream.Write(byteArray, 0, byteArray.Length)

        newStream.Flush()

        newStream.Close()



       

        Dim res As HttpWebResponse = CType(request.GetResponse(), HttpWebResponse)

        mySaveCookieContainer.Add(res.Cookies)

        pageHtml = New StreamReader(res.GetResponseStream(), Encoding.UTF8).ReadToEnd()

        Dim a = res.Headers(HttpResponseHeader.Location)