Ajax CSRF issue

after.js

$.ajax({
    url: '/combat_instance',
    type: 'post',
    beforeSend: function(jqXHR, settings) {
      jqXHR.setRequestHeader('X-CSRF-Token', $('meta[name="csrf-token"]').attr('content'));
    },
    success: function(data) {
      Game.CombatInstance.parseCreateData(data);
    }
});

before.js

$.ajax({
    url: '/combat_instance',
    type: 'post',
    success: function(data) {
      Game.CombatInstance.parseCreateData(data);
    }
});