protected override Task <HttpResponseMessage> SendAsync(HttpRequestMessage request, CancellationToken cancellationToken) { var parameters = new Dictionary <string, string> { { "oauth_token", _accessToken }, { "oauth_token_secret", _accessTokenSecret } }; request.Headers.Authorization = _oauthSvc.GetOAuthHeader(request.Method, request.RequestUri.AbsoluteUri, parameters); // return(base.SendAsync(request, cancellationToken)); }