Access TFS Rest API but i get "Unauthorized" issue

Hi All,

 public class BasicAuthenticationFilter : IHttpRequestHeaderFilter
    {
        private string _authToken;

        public BasicAuthenticationFilter(NetworkCredential userCredential)
        {
            _authToken = Convert.ToBase64String(ASCIIEncoding.ASCII.GetBytes(string.Format("{0}:{1}:{2}",userCredential.UserName, userCredential.Password,

userCredential.Domain

)));
        }

        public HttpRequestHeaders ProcessHeaders(HttpRequestHeaders headers)
        {
            headers.Authorization = new AuthenticationHeaderValue("Basic", _authToken);
            return headers;
        }
    }

Code like this：new NetworkCredential("myuseranme", "mypwd", "mydomain")

I need to access TFS rest API. But i still geting the issue when i request the uri and set httpclilent heads value：

“You do not have permission to view this directory or page using the credentials that you supplied.”

anybody know this? thanks

Code：

https://vsorest.codeplex.com/discussions/587525

True mastery of any skill takes a lifetime.