使用.net框架3.5进行httpwebrequest代理身份验证时，返回407错误

Question

我在.net Framework3.5项目中使用了以下代码：

HttpWebRequest request = (HttpWebRequest) HttpWebRequest.Create(ServiceUri);
WebProxy proxy = new WebProxy();
proxy.Address = new Uri(ProxyUri);
proxy.Credentials = new NetworkCredential(userName, pass, domain);
request.Proxy = proxy;
request.Method = "POST";  
request.ContentType = "application/xml";
request.Accept = "application/xml";
byte[] content = Encoding.UTF8.GetBytes(xmlRequest.ToString());
request.ContentLength = content.Length;
using (var stream = request.GetRequestStream())
{
   stream.Write(content, 0, content.Length);
}
HttpWebResponse response = (HttpWebResponse) request.GetResponse();

最后一行告诉我“需要407代理身份验证”。但是如果我添加到config中，它就可以工作：

  <startup>
    <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.0" />
  </startup>

如果不使用clr 4.0，我如何让它工作？

Answer 1

孙，

我通过以下方式解决了这个问题：

proxy.UseDefaultCredentials = true;