问远程服务器返回错误：(401)在Zendesk中未经授权

EN

 string authTicket = "asdfsafdsafsdafdsafsf";       
 username = "user@mysite.com";
 string api_url = "https://mysite.zendesk.com/users/current.json";  
 string base64_creds = Convert.ToBase64String(Encoding.UTF8.GetBytes(username + ":" + authTicket));
 HttpWebRequest request = WebRequest.Create(api_url) as HttpWebRequest;
 request.Headers.Add("Authorization", "Basic " + base64_creds);
 using (HttpWebResponse response = request.GetResponse() as HttpWebResponse)
 {
      StreamReader reader = new StreamReader(response.GetResponseStream());
      string content = reader.ReadToEnd();
      //return Content(content);
      return View("https://mysite.zendesk.com/entries/mypage");
 }