CoreFilter does not work

My controller:
<?php

namespace app\modules\api\controllers;

use Yii;

use yii\rest\ActiveController;

use app\modules\api\models\RegisterForm;

class UserController extends ActiveController

{

    public $modelClass = 'app\models\User';

    public function behaviors()

    {

        return array_merge(parent::behaviors(), [

            'contentNegotiator' => [

                'class' => 'yii\filters\ContentNegotiator',

                'formats' => [

                    'application/json' => \yii\web\Response::FORMAT_JSON,

                ],

            ],

            'corsFilter' => [

                'class' => '\yii\filters\Cors',

                'cors' => [

                    'Origin' => ['*'],

                    'Access-Control-Request-Method' => ['POST'],

                    // Allow only headers 'X-Wsse'

                    'Access-Control-Request-Headers' => ['X-Wsse'],

                    // Allow credentials (cookies, authorization headers, etc.) to be exposed to the browser

                    'Access-Control-Allow-Credentials' => true,

                    // Allow OPTIONS caching

                    'Access-Control-Max-Age' => 3600,

                    // Allow the X-Pagination-Current-Page header to be exposed to the browser.

                    'Access-Control-Expose-Headers' => ['X-Pagination-Current-Page'],

                ],

            ]

        ]);

    }

    public function actions()

    {

        $actions = parent::actions();

        unset($actions['create']);

        return $actions;

    }

    public function actionCreate()

    {

        $model = new RegisterForm;

        $model->load(Yii::$app->request->post(), '');

        return $model->register();

    }

}

In the first, I want to create a REST API app. But I have problems about CORS policy. I think that CoreFilter CoreFilter does not work, because I private my methods (only POST). But then I test my code in Postman programm, where I can create all methods. Headers are not sent too.

Headers:

As you can see, there are no headers (Access-Control-Request-Method, Origin, Access-Control-Max-Age)

web.php

<?php

$params = require __DIR__ . '/params.php';

$db = require __DIR__ . '/db.php';

$config = [

    'id' => 'basic',

    'basePath' => dirname(__DIR__),

    'bootstrap' => ['log'],

    'aliases' => [

        '@bower' => '@vendor/bower-asset',

        '@npm'   => '@vendor/npm-asset',

    ],

    'components' => [

        'request' => [

            // !!! insert a secret key in the following (if it is empty) - this is required by cookie validation

            'cookieValidationKey' => 'rGJNpSpcsZ09MXSczMMJwqx9qBv_paj2',

            'baseUrl'=> '',

            'parsers' => [

                'application/json' => 'yii\web\JsonParser',

            ]

        ],

        'cache' => [

            'class' => 'yii\caching\FileCache',

        ],

        'user' => [

            'identityClass' => 'app\models\User',

            'enableAutoLogin' => false,

            'enableSession' => false

        ],

        'errorHandler' => [

            'errorAction' => 'site/error',

        ],

        'mailer' => [

            'class' => 'yii\swiftmailer\Mailer',

            // send all mails to a file by default. You have to set

            // 'useFileTransport' to false and configure a transport

            // for the mailer to send real emails.

            'useFileTransport' => true,

        ],

        'log' => [

            'traceLevel' => YII_DEBUG ? 3 : 0,

            'targets' => [

                [

                    'class' => 'yii\log\FileTarget',

                    'levels' => ['error', 'warning'],

                ],

            ],

        ],

        'db' => $db,

        'urlManager' => [

            'showScriptName' => false,

            'enablePrettyUrl' => true,

            'rules' => [

                ['class' => 'yii\rest\UrlRule', 'controller' => 'api/user',  'pluralize' => false]

            ],

        ],

    ],

    'modules' => [

        'api' => [

            'class' => 'app\modules\api\Module',

        ],

    ],

    'params' => $params,

];

if (YII_ENV_DEV) {

    // configuration adjustments for 'dev' environment

    $config['bootstrap'][] = 'debug';

    $config['modules']['debug'] = [

        'class' => 'yii\debug\Module',

        // uncomment the following to add your IP if you are not connecting from localhost.

        //'allowedIPs' => ['127.0.0.1', '::1'],

    ];

    $config['bootstrap'][] = 'gii';

    $config['modules']['gii'] = [

        'class' => 'yii\gii\Module',

        // uncomment the following to add your IP if you are not connecting from localhost.

        //'allowedIPs' => ['127.0.0.1', '::1'],

    ];

}

return $config;