private function handleCodeOperations($request)
 {
     include_once __DIR__ . '/../dataController/CodeController.php';
     if (isset($request[1])) {
         $codeController = new CodeController($request[1]);
         if (isset($request[2])) {
             $this->setResponseCodesAndData($codeController->getById($request[2]), 1);
         } else {
             $this->setResponseCodesAndData($codeController->getAll(), 1);
         }
     } else {
         $this->setResponseCodesAndData('specify code type (e.g. serverName/api/item_category)', 5);
     }
 }