Yii2 ウェブサイトの URL からフロントエンドとバックエンドのディレクトリを非表示にする方法は?

Options +FollowSymlinks
RewriteEngine On

# Handle admin URL separately
RewriteCond %{REQUEST_URI} ^/(admin)
RewriteRule ^admin/assets/(.*)$ backend/web/assets/ [L]
RewriteRule ^admin/css/(.*)$ backend/web/css/ [L]
RewriteCond %{REQUEST_URI} !^/backend/web/(assets|css)/
RewriteCond %{REQUEST_URI} ^/(admin)
RewriteRule ^.*$ backend/web/index.php [L]

# Handle frontend assets
RewriteCond %{REQUEST_URI} ^/(assets|css)
RewriteRule ^assets/(.*)$ frontend/web/assets/ [L]
RewriteRule ^css/(.*)$ frontend/web/css/ [L]
RewriteRule ^js/(.*)$ frontend/web/js/ [L]
RewriteRule ^images/(.*)$ frontend/web/images/ [L]

# Handle frontend
RewriteCond %{REQUEST_URI} !^/(frontend|backend)/web/(assets|css)/
RewriteCond %{REQUEST_URI} !index.php
RewriteCond %{REQUEST_FILENAME} !-f [OR]
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^.*$ frontend/web/index.php

<code class="php">namespace common\components;

class Request extends \yii\web\Request {
    public $web;
    public $adminUrl;

    public function getBaseUrl() {
        return str_replace($this->web, "", parent::getBaseUrl()) . $this->adminUrl;
    }

    public function resolvePathInfo() {
        if ($this->getUrl() === $this->adminUrl) {
            return "";
        } else {
            return parent::resolvePathInfo();
        }
    }
}</code>

<code class="php">// frontend
'request' => [
    'class' => 'common\components\Request',
    'web' => '/frontend/web'
],

// backend
'request' => [
    'class' => 'common\components\Request',
    'web' => '/backend/web',
    'adminUrl' => '/admin'
],</code>

RewriteEngine On
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*)$ /index.php?/ [L]