HTTP 请求标头中缺少基本 HTTP 身份验证条目

Question

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 我收到以下信息：

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

没有身份验证条目。我错过了什么？

Answer 1

尝试老式的方法：

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

IIRC WebClient 在收到来自服务器的 401 质询之前不会发送授权请求标头。