public async Task <RequestResult> AdicionarAsync(AdicionarModel model)
 {
     using (var response = await _httpClient.PostAsJsonAsync("pretendente", model))
     {
         if (response.StatusCode == HttpStatusCode.NotFound)
         {
             return(null);
         }
         return(await response.Content.ReadAsAsync <RequestResult>());
     }
 }
        public async Task <IActionResult> Adicionar(AdicionarModel model)
        {
            if (!ModelState.IsValid)
            {
                return(View(model));
            }

            var resultado = await _servico.AdicionarAsync(model);

            if (resultado.Sucesso)
            {
                return(RedirectToAction("Index"));
            }

            foreach (string error in resultado.Errors)
            {
                ModelState.AddModelError("", error);
            }
            return(View(model));
        }