How to run php script before user connection?

Good evening everyone. The question arose of the implementation of the iso definition of the user's country code, to determine his language. This question is currently implemented as follows:

JS

$(document).ready(function () {
    $.ajax({
        type: "POST",
        url: "{{ route('check_locale') }}",
        contentType: false,
        processData: false,
        async: true,
        dataType: "json",
        data: {_token: $('meta[name="csrf-token"]').attr('content')},
        timeout: 3000
    });
    return false;
});

PHP

public function check_user_locale() {
    $reader = new Reader(resource_path('assets/geoip/GeoLite2-City.mmdb'));
    if ($this->check_ip->getUserIpAddr() == '127.0.0.1') {
        $ip = '8.8.8.8';
    } else { $ip = $this->check_ip->getUserIpAddr(); }
    $record = $reader->city($ip);
    // Change locale
    $locale = session()->get('locale');
    $country_code = $record->country->isoCode;
    if (!isset($locale)) {
        switch ($country_code) {
            case "UA":
                session()->put('locale', 'ua');
                App::setLocale('ua');
                break;
            case 'RU':
            case 'BY':
                session()->put('locale', 'ru');
                App::setLocale('ru');
                break;
            default:
                session()->put('locale', 'en');
                App::setLocale('en');
                break;
        }
    } else {
        return false;
    }
}

But this option is not correct, since it works only when the user actually connected to the site and received the content

Please tell me how can I run this function before connecting or during? Thanks in advance!