/common/config

<?php
return [
    'vendorPath' => dirname(dirname(__DIR__)) . '/vendor',
    'components' => [
        'cache' => [
            'class' => 'yii\caching\FileCache',
        ],

	'request' => [
            'baseUrl' => ''
        ],
        'urlManager' => [
            'enablePrettyUrl' => true,
            'enableStrictParsing' => false,
            'showScriptName' => false,
            'rules' => [
                'defaultRoute' => 'site/index',
                //['class' => 'yii\rest\UrlRule', 'api/items/<id:\d+>' => 'api/items', 'verb' => 'GET'],
                ['class' => 'yii\rest\UrlRule', 'controller' => ['api/items', 'api/items/<id:\d+>','api/categories']],
            ],
        ],
    ],
];