validator and ajax request

I have some validation function, but those functions are on the server side, there is any way to make handsontable check using an ajax request ?
I would need something like this: 
columns: [
    {data: 'filesystem', 
     validator: {
    			url: server_url + '/validate_field/',
    			type: "post",
    			data: {
    				type: param.type,
    				action: param.action
    			}
    },
    allowInvalid: false}
  ]
this way it could by synchronized.
thanks for your help,
Jerome