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));
}