protected void ManipulatePdf(String dest)
{
PdfDocument pdfDoc = new PdfDocument(new PdfReader(SRC), new PdfWriter(dest));
PdfAcroForm form = PdfAcroForm.GetAcroForm(pdfDoc, true);
PdfButtonFormField button = PdfFormField.CreatePushButton(pdfDoc,
new Rectangle(36, 700, 36, 30), "post", "POST");
button.SetBackgroundColor(ColorConstants.GRAY);
button.SetValue("POST");
// The second parameter is optional, it declares which fields to include in the submission or which to exclude,
// depending on the setting of the Include/Exclude flag.
button.SetAction(PdfAction.CreateSubmitForm("http://itextpdf.com:8180/book/request", null,
PdfAction.SUBMIT_HTML_FORMAT | PdfAction.SUBMIT_COORDINATES));
button.SetVisibility(PdfFormField.VISIBLE_BUT_DOES_NOT_PRINT);
form.AddField(button);
pdfDoc.Close();
}