Framework section from the app/config/config.yml

config.yml

framework:
    #esi:             ~
    translator:      { fallback: %locale% }
    secret:          %secret%
    router:
        resource: "%kernel.root_dir%/config/routing.yml"
        strict_requirements: %kernel.debug%
    form:            true
    csrf_protection: true
    validation:      { enable_annotations: true }
    templating:
        engines: ['twig']
        #assets_version: SomeVersionScheme
    default_locale:  %locale%
    trusted_proxies: ~
    session:
        gc_maxlifetime: 1800
        gc_probability: 1
        gc_divisor: 1