Yii2 backend UrlManager not working properly

Question

I've got a problem with my backend url manager which is obviously doing different thing then my frontend.

frontend url: www.example.com/frontend/web/site/index

backend url: www.example.com/backend/web/index.php/site/login

Both urls are working when request like above. But when i call the backend url like frontend without the index.php, i just receive 404. Also my site/index is not working, because when i enter it trough backend/web/index.php/site/index, i get redirected to backend/web/index.php/site/login immediatly. I thinkg those two have the same problem. But it is strange, because both main.php are almost equally:

---

SOLUTION: Missing /backend/web/.htaccess file

RewriteEngine on

RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d

RewriteRule . index.php

---

frontend/config/main.php

<?php
$params = array_merge(
    require __DIR__ . '/../../common/config/params.php',
    require __DIR__ . '/../../common/config/params-local.php',
    require __DIR__ . '/params.php',
    require __DIR__ . '/params-local.php'
);

return [
    'id' => 'app-frontend',
    'basePath' => dirname(__DIR__),
    'bootstrap' => ['log'],
    'controllerNamespace' => 'frontend\controllers',
    'components' => [
        'request' => [
            'csrfParam' => '_csrf-frontend',
        ],
        'user' => [
            'identityClass' => 'common\models\User',
            'enableAutoLogin' => true,
            'identityCookie' => ['name' => '_identity-frontend', 'httpOnly' => true],
        ],
        'session' => [
            'name' => 'advanced-frontend',
        ],
        'log' => [
            'traceLevel' => YII_DEBUG ? 3 : 0,
            'targets' => [
                [
                    'class' => 'yii\log\FileTarget',
                    'levels' => ['error', 'warning'],
                ],
            ],
        ],
        'errorHandler' => [
            'errorAction' => 'site/error',
        ],
        'urlManager' => [
            'enablePrettyUrl' => true,
            'showScriptName' => false,
        ],
    ],
    'params' => $params,
];

backend/config/main.php

<?php
$params = array_merge(
    require __DIR__ . '/../../common/config/params.php',
    require __DIR__ . '/../../common/config/params-local.php',
    require __DIR__ . '/params.php',
    require __DIR__ . '/params-local.php'
);

return [
    'id' => 'app-backend',
    'basePath' => dirname(__DIR__),
    'controllerNamespace' => 'backend\controllers',
    'bootstrap' => ['log'],
    'modules' => [],
    'components' => [
        'request' => [
            'csrfParam' => '_csrf-backend',
        ],
        'user' => [
            'identityClass' => 'common\models\User',
            'enableAutoLogin' => true,
            'identityCookie' => ['name' => '_identity-backend', 'httpOnly' => true],
        ],
        'session' => [
            'name' => 'advanced-backend',
        ],
        'log' => [
            'traceLevel' => YII_DEBUG ? 3 : 0,
            'targets' => [
                [
                    'class' => 'yii\log\FileTarget',
                    'levels' => ['error', 'warning'],
                ],
            ],
        ],
        'errorHandler' => [
            'errorAction' => 'site/error',
        ],
        'urlManager' => [
            'enablePrettyUrl' => true,
            'showScriptName' => false,
        ],
    ],
    'params' => $params,
];

I would be glad if someone could help me with this. Please just ask for furth or missing informations.