def post(self): dataUrlPattern = re.compile('data:image/(png|jpeg);base64,(.*)$') file_data = self.request.get("file") imgb64 = dataUrlPattern.match(file_data).group(2) caption = self.request.get("caption") upload = Upload() upload.file = db.Blob(base64.b64decode(imgb64)) upload.caption = caption upload.put() self.redirect("/")