public async Task<ActionResult> RedirectShortUrl(string hash)
        {
            var svc = new ShortUrlService();
            var shortUrl = svc.GetShortUrlByHash(hash);

            return new RedirectResult(shortUrl.Original);
        }
 // GET api/Shortner/5
 public ShortUrl Get(string id)
 {
     var svc = new ShortUrlService();
     var shortUrl = svc.GetShortUrlByHash(id);
     if (shortUrl == null)
     {
         throw new HttpResponseException(HttpStatusCode.NotFound);
     }
     return shortUrl;
 }