414 Request-URI Too Large - MooTools
When URI is longer than 256 characters, request string produce error.
The difference between GET and POST is that with a GET, you encode all parameters in the URL; with a POST, you send them in the request body, not the URL. So the URL length limit applies (this is largely the original reason for POST).
FIX: Replace method get to post
var req = url:'getData.php',