public ActionResult <IEnumerable <string> > Get(string relativeUrl)
        {
            var hs       = new HostServices(_settings.Tenant, _settings.Tenant, _serviceUrl, _settings.ApiKey);
            var filePath = _settings.Url + relativeUrl;

            try
            {
                var content = hs.GetContent(filePath);
                //TODO: consider caching content locally for speed
                return(File(content.Blob, GetContentType(content.Filename)));
            }
            catch (System.Exception ex)
            {
                if (ex.Message.Contains("authenticated"))
                {
                    return(Unauthorized());
                }
                return(NotFound());
            }
        }