public IActionResult Action()
{
	try
	{
		var data = JObject.Parse(this.HttpContext.Request.Form["data"]);
		var action = data["action"].ToString();
		switch (action)
		{
			case "Initialize":
				var initData = StiWebForm.Initialize(data, null);
				return Json(initData.Content);               

			default:
				var result = StiWebForm.ProcessRequest(data);
				return result.ContentType switch
				{
					"application/pdf" => new FileContentResult(result.Content as byte[], result.ContentType),
					_ => Json(result.Content),
				};
		}
	}
	catch (Exception e)
	{
		return new ContentResult()
		{
			Content = e.Message,
			ContentType = "text/plain"
		};    
	}
}