public IActionResult DownloadPDFFile(string pageName)
        {
            var pdf = new GeneratePdf($"https://{Request.Host.Value}/{pageName}");

            var pdfFile   = pdf.GetPdf();
            var pdfStream = new System.IO.MemoryStream(pdfFile);

            return(new FileStreamResult(pdfStream, "application/pdf"));
        }