in synfony4 How to force locale 'en' without taking the prefered language - locale

Question

in synfony4 i took the symfony demo app, and o want to know How can I force defaultlocale to 'en' to my homepage without taking the prefered language of the browser 'fr'. I just want to keed the choice to change the language manually only
SERVICE.yaml
parameters:
locale: 'en'
# This parameter defines the codes of the locales (languages) enabled in the application
app_locales: en|fr|de|es|cs|nl|ru|uk|ro|pt_BR|pl|it|ja|id|ca|sl|hr|zh_CN|bg|tr|lt
app.notifications.email_sender: anonymous#example.com
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.
bind: # defines the scalar arguments once and apply them to any service defined/created in this file
$locales: '%app_locales%'
$defaultLocale: 'en'
$emailSender: '%app.notifications.email_sender%'
FRAMEWORK.yaml
framework:
default_locale: 'en'
I expected the first redirection will be 127.0.0.1:8000/en or 127.0.0.1:8000
But the actual output is 127.0.0.1:8000/fr

Answer 1

You can just get rid of all the locales and the default locale parameters so in services.yaml you are left with:
parameters:
locale: 'en'
app.notifications.email_sender: anonymous#example.com
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.
bind: # defines the scalar arguments once and apply them to any service defined/created in this file
$emailSender: '%app.notifications.email_sender%'
in framework.yaml you can simply remove the line.
When there is only one locale set there is no redirection to a locale, so will go to 127.0.0.1:8000 on the built-in server.

Answer 2

I found it.
I change this in the getpreferedLanguage method, it works, it does what i expected.
if ($preferredLanguage !== $this->defaultLocale) {
$response = new RedirectResponse($this->urlGenerator->generate('homepage', ['_locale' => 'en']));
$event->setResponse($response);
}