public HttpResponseMessage ExportAssessment(Assessment assessment, ExportFormat format)
{
var stream = new MemoryStream();
AssessmentService.ExportAssessment(assessment, format, stream);
stream.Position = 0;
var result = new HttpResponseMessage(HttpStatusCode.OK);
result.Content = new StreamContent(stream);
result.Content.Headers.ContentType =
new MediaTypeHeaderValue("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet");
result.Content.Headers.ContentDisposition = new ContentDispositionHeaderValue("attachment");
result.Content.Headers.ContentDisposition.FileName = "export.xlsx";
//add content disposition in header
result.Content.Headers.Add("Access-Control-Expose-Headers", "Content-Disposition");
return(result);
}