fix: backward compitability issue for wp_is_serving_rest_request

Author: abdul-kaioum

src/Http/RequestType.php

@@ -28,13 +28,13 @@ public static function is($type)
                 return is_admin();
 
             case self::AJAX:
-                return \defined('DOING_AJAX');
+                return \defined('DOING_AJAX') && DOING_AJAX;
 
             case self::CRON:
-                return \defined('DOING_CRON');
+                return \defined('DOING_CRON') && DOING_CRON;
 
             case self::API:
-                return \defined('REST_REQUEST');
+                return \defined('REST_REQUEST') && REST_REQUEST;
 
             case self::FRONTEND:
                 return (!is_admin() || \defined('DOING_AJAX')) && !\defined('DOING_CRON');

src/Http/Router/RouteRegister.php

@@ -470,7 +470,7 @@ private function invokeAsReflection($class, $method, $params = [])
             $requestParams[] = $this->getParamValue($param);
         }
 
-        if (wp_is_serving_rest_request() && isset($this->_restResponse)) {
+        if (RequestType::is(RequestType::API) && isset($this->_restResponse)) {
             // maybe failed at middleware,authorization or validation
 
             return Response::instance();