更新记录，使用HttpWebRequest API依旧无效，代理设置false也无效
HttpWebRequest wbRequest = (HttpWebRequest)WebRequest.Create(link);
wbRequest.Proxy = null;
wbRequest.Method = "GET";
HttpWebResponse wbResponse = (HttpWebResponse)wbRequest.GetResponse();
using (Stream responseStream = wbResponse.GetResponseStream())
{
using (StreamReader sReader = new StreamReader(responseStream))
{
result = await sReader.ReadToEndAsync();
}
}
