HTTP请求标头中缺少基本HTTP身份validation条目

我有以下代码：

WebClient client = new WebClient(); String un = "Username"; String pw = "Password"; client.Credentials = new System.Net.NetworkCredential(un,pw); client.DownloadFileCompleted += new AsyncCompletedEventHandler(downloadFileCompleted); client.DownloadFileAsync(new Uri(url), Config.LocalDir + @"\data\supportData.xml"); 

在服务器上使用NetworkMonitor我收到以下内容：

 Http: Request, GET /audiClave/REST/en/actions Command: GET URI: /audiClave/REST/en/actions ProtocolVersion: HTTP/1.1 Host: 210.xxx.xxx.xxx:8080 Connection: Keep-Alive HeaderEnd: CRLF 

没有validation条目。 我错过了什么？

Answer 1

尝试老式的方式：

 string credentials = Convert.ToBase64String(Encoding.ASCII.GetBytes(un + ":" + pw)); client.Headers[HttpRequestHeader.Authorization] = "Basic " + credentials; 

IIRC WebClient在从401服务器获得质询之前不会发送授权请求标头。