JQUERY AJAX POST and how to receive data via Classic ASP

[Swi]

I have the following:

        $.ajax({
            type: 'POST',
            url: 'save_request.asp',
            data: { griddata: JSON.stringify(datainfo)},
            dataType: "json"})
            .done(function(data) {
              $("#dialog").dialog({
            	  modal: true,
            	  title: "Response Information",
            	  width: 250,
            	  height: 150,
            	  buttons: {
            		  Close: function () {
            			  $(this).dialog('close');
            		  }
            	  },
            	  open: function () {
            		  $("#dialog").html(data);
                    $(".ProcessingOverlay").hide();
            	  }
              });
            })
            .fail( function(xhr, textStatus, errorThrown) {
                    alert(xhr.responseText);
            })
            //.always(function() { alert("complete"); });
        }
    })

How do I *receive* this data via Classic ASP to process it?

I keep getting Operation not Allowed using this when posted to the ASP page.

data = Request.form("griddata")

Swi