symfony/framework-bundle

config/packages/cache.yaml

framework:
    cache:
        # Unique name of your app: used to compute stable namespaces for cache keys.
        #prefix_seed: your_vendor_name/app_name

        # The "app" cache stores to the filesystem by default.
        # The data in this cache should persist between deploys.
        # Other options include:

        # Redis
        #app: cache.adapter.redis
        #default_redis_provider: redis://localhost

        # APCu (not recommended with heavy random-write workloads as memory fragmentation can cause perf issues)
        #app: cache.adapter.apcu

        # Namespaced pools use the above "app" backend by default
        #pools:
            #my.dedicated.cache: null

config/packages/framework.yaml

# see https://symfony.com/doc/current/reference/configuration/framework.html
framework:
    secret: '%env(APP_SECRET)%'
    #csrf_protection: true
    http_method_override: false
    catch_all_throwables: true

    # Enables session support. Note that the session will ONLY be started if you read or write from it.
    # Remove or comment this section to explicitly disable session support.
    session:
        handler_id: null
        cookie_secure: auto
        cookie_samesite: lax
        storage_factory_id: session.storage.factory.native

    #esi: true
    #fragments: true
    php_errors:
        log: true

when@test:
    framework:
        test: true
        session:
            storage_factory_id: session.storage.factory.mock_file

config/preload.php

<?php

if (file_exists(dirname(__DIR__).'/var/cache/prod/App_KernelProdContainer.preload.php')) {
    require dirname(__DIR__).'/var/cache/prod/App_KernelProdContainer.preload.php';
}

config/routes/framework.yaml

when@dev:
    _errors:
        resource: '@FrameworkBundle/Resources/config/routing/errors.xml'
        prefix: /_error

config/services.yaml

# This file is the entry point to configure your own services.
# Files in the packages/ subdirectory configure your dependencies.

# Put parameters here that don't need to change on each machine where the app is deployed
# https://symfony.com/doc/current/best_practices.html#use-parameters-for-application-configuration
parameters:

services:
    # default configuration for services in *this* file
    _defaults:
        autowire: true      # Automatically injects dependencies in your services.
        autoconfigure: true # Automatically registers your services as commands, event subscribers, etc.

    # makes classes in src/ available to be used as services
    # this creates a service per class whose id is the fully-qualified class name
    App\:
        resource: '../src/'
        exclude:
            - '../src/DependencyInjection/'
            - '../src/Entity/'
            - '../src/Kernel.php'

    # add more service definitions when explicit configuration is needed
    # please note that last definitions always *replace* previous ones

public/index.php

<?php

use App\Kernel;

require_once dirname(__DIR__).'/vendor/autoload_runtime.php';

return function (array $context) {
    return new Kernel($context['APP_ENV'], (bool) $context['APP_DEBUG']);
};

src/Controller/.gitignore

# Empty file

src/Kernel.php

<?php

namespace App;

use Symfony\Bundle\FrameworkBundle\Kernel\MicroKernelTrait;
use Symfony\Component\HttpKernel\Kernel as BaseKernel;

class Kernel extends BaseKernel
{
    use MicroKernelTrait;
}