HttpWebRequest設置用戶名密碼后, 依然返回401未授權錯誤

 

HttpWebRequest設置用戶名密碼后, 依然返回401未授權錯誤, 手動在請求中添加授權標識頭["Authorization"],

但是, base64一下用戶名和密碼, 安全問題???  內網環境, 這位提待解決!

                            string _svnDBPath = "http://192.168.199.66/svn/FAE/";
                            if (!db.StartsWith(_svnDBPath))
                                throw new Exception("");
                            HttpWebRequest myRequest = (HttpWebRequest)HttpWebRequest.Create(db.Trim());
                            CredentialCache myCache = new CredentialCache();
                            myCache.Add(new Uri(_svnPath), "Basic", new NetworkCredential(_svnUName, _svnPwd));
                            myRequest.Credentials = myCache;
                            myRequest.Headers["Authorization"] = "Basic " + Convert.ToBase64String(Encoding.Default.GetBytes(_svnUName + ":" + _svnPwd)); 
                            myRequest.GetResponse();