更改app.config中的默认代理地址后出现404错误

Question

我想在c＃中使用WebClient连接到互联网 连接成功但在更改app.config中的代理配置后停止工作

这是配置

<system.net>
  <defaultProxy enabled="true">
    <proxy proxyaddress="http://192.168.10.33"/>
  </defaultProxy>
</system.net>

以及我如何连接互联网

public async Task<T> PostAsync<T>(string uri, NameValueCollection pairs)
        {
            byte[] response = null;

            using (WebClient client = new WebClient())
            {
                try
                {
                    response = await Task<byte[]>.Factory.StartNew(() =>
                    {
                        return client.UploadValues(uri, pairs);
                    });
                }
                catch (WebException e)
                {
                    Trace.WriteLine(e);
                    response = null;
                }
            }

            if (response != null)
            {
                string resultAsString = System.Text.Encoding.UTF8.GetString(response);
                T result = JsonConvert.DeserializeObject<T>(resultAsString);
                return result;
            }

            return default(T);
        }