Angularjs 웹Api를 통해 excel 다운로드

 protected HttpResponseMessage GenereateExcelMessage(HttpRequestMessage Request, string fileName, string generatedFile)
        {
            if (System.IO.File.Exists(generatedFile))
            {
                var response = Request.CreateResponse(HttpStatusCode.OK);
                System.IO.FileStream fileStream = new System.IO.FileStream(generatedFile, System.IO.FileMode.Open, System.IO.FileAccess.Read);

                System.IO.MemoryStream ms = new System.IO.MemoryStream();
                fileStream.CopyTo(ms);
                response.Content = new ByteArrayContent(ms.ToArray());
                response.Content.Headers.ContentDisposition = new System.Net.Http.Headers.ContentDispositionHeaderValue("attachment");
                response.Content.Headers.ContentDisposition.FileName = fileName;
                response.Content.Headers.ContentType = new System.Net.Http.Headers.MediaTypeHeaderValue("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet");

                return response;
            }
            else
            {
                return Request.CreateResponse(HttpStatusCode.InternalServerError);
            }
        }

this.exportExcel = function (SearchOption) {
            return $http.post('/api/XXXl', { paramenters: XX }, { responseType: "arraybuffer" }).then(function (response) {
                var data = new Blob([response.data], { type: response.headers('Content-Type') });
                var filename = response.headers('Content-Disposition').split(';')[1].trim().substr('filename='.length);
                FileSaver.saveAs(data, filename);
            });
        };