protected override async Task <HttpResponseMessage> SendAsync(HttpRequestMessage request, CancellationToken cancellationToken) { var auth = request.Headers.Authorization; if (auth != null) { var token = await _provider.GetToken().ConfigureAwait(false); request.Headers.Authorization = new AuthenticationHeaderValue(auth.Scheme, token); } if (request.Headers.Remove(Constants.AccountIdHeaderName)) { var id = _provider.GetAccountId(); request.Headers.Add(Constants.AccountIdHeaderName, id); } return(await base.SendAsync(request, cancellationToken).ConfigureAwait(false)); }