The server responded with a status of 405 (Method Not Allowed) Using GET Method

$('.itemName').select2({ placeholder: 'Select an item', ajax: { type: "GET", url: '', contentType: "application/json; charset=utf-8", dataType: 'json', delay: 250, processResults: function (data) { return { results: $.map(data, function (item) { return { text: item.country_name, id: item.id } }) }; }, cache:false } });

via Chebli Mohamed