VB.net HttpWebRequest 403错误

我的代码是100%工作，但当我尝试填写yelp.com下的表格时，它给我403错误。这是我的密码：

    Dim cweb As String = "http://www.yelp.com/biz_share?bizid=T6XCD1_eLEk3LaSp8C7E1g&return_url=%2Fbiz%2Fmr-c-los-angeles-2"
    Dim POST As String = "csrftok=6cc5dea3ff8bf8f404f1e7a4951342cb2f132a17cb625a3988c50027d358285d&context=pyZQEaHS1YbhP3EEsTKGww&action_submit=1&emails=samplemail@gmail.com&emails=&emails=&unauth_name=Test+Name&unauth_email=testemail%40email.com&note=How%27s+it+going%3F"
    Dim request As HttpWebRequest
    Dim response As HttpWebResponse
    Dim tempCookies As New CookieContainer

    request = CType(WebRequest.Create(cweb), HttpWebRequest)
    request.UserAgent = "Mozilla/5.0 (Windows NT 6.1; WOW64; rv:23.0) Gecko/20100101 Firefox/23.0"
    request.AllowAutoRedirect = True
    request.ContentType = "application/x-www-form-urlencoded"
    request.ContentLength = POST.Length
    request.Method = "POST"
    request.KeepAlive = True
    request.CookieContainer = tempCookies


    Dim requestStream As Stream = request.GetRequestStream()
    Dim postBytes As Byte() = Encoding.ASCII.GetBytes(POST)
    requestStream.Write(postBytes, 0, postBytes.Length)
    requestStream.Close()

    response = CType(request.GetResponse(), HttpWebResponse)
    tempCookies.Add(response.Cookies)
    Dim postreader As New StreamReader(response.GetResponseStream())
    Dim thepage As String = postreader.ReadToEnd
    response.Close()

我基于的web表单如下所示：

http://www.yelp.com/biz_share?bizid=T6XCD1_eLEk3LaSp8C7E1g&return_url=%2Fbiz%2Fmr-c-los-angeles-2

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在其他网络表单上，我可以填写并发送它们，这是否意味着yelp.com不允许您发送任何网络请求？我现在真的很困惑。任何帮助都将乐意接受，提前感谢。

csrftok将针对每个用户/会话进行更改，403存在，因为您的身份验证数据不正确/csrftok对会话无效。您需要转到此之前的页面（或登录页面或类似页面）以获取正确的令牌。

鉴于403是一个禁止的错误，我假设Yelp正在阻止来自未经身份验证的地址的post请求。是否有任何方法可以绕过此阻止？除非您能够在Yelp通过服务器身份验证。至少，没有合法的途径。最好从yelp.com开始——见一节。我不知道他们是否允许远程发布内容，但那将是开始搜索的最佳地点。我将通过该链接进行探索。谢谢，我希望我能找到一些有用的东西。