xF2 Add-on Custom HTTP Client headers 1.0.0 Alpha

<?php

// database options ...
// additional options for caching (for example), proxying all HTTP requests and another...

$config['http']['headers'] = [
    // Prefers russian language; if not present - then english or any another language
    // More details: https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Accept-Language
    'Accept-Language' => 'ru, en;q=0.9, *:q=0.5'
];