Timber\URLHelper::get_scheme PHP Method

    public static function get_scheme()
    {
        return isset($_SERVER['HTTPS']) && $_SERVER['HTTPS'] === 'on' ? 'https' : 'http';
    }

 /**
  * Get context.
  * @api
  * @return array
  */
 public static function get_context()
 {
     if (empty(self::$context_cache)) {
         self::$context_cache['http_host'] = URLHelper::get_scheme() . '://' . URLHelper::get_host();
         self::$context_cache['wp_title'] = Helper::get_wp_title();
         self::$context_cache['wp_head'] = Helper::function_wrapper('wp_head');
         self::$context_cache['wp_footer'] = Helper::function_wrapper('wp_footer');
         self::$context_cache['body_class'] = implode(' ', get_body_class());
         self::$context_cache['site'] = new Site();
         self::$context_cache['request'] = new Request();
         $user = new User();
         self::$context_cache['user'] = $user->ID ? $user : false;
         self::$context_cache['theme'] = self::$context_cache['site']->theme;
         //Not yet! but this will soon be the default...
         //self::$context_cache['posts'] = new PostQuery();
         self::$context_cache['posts'] = Timber::query_posts();
         self::$context_cache = apply_filters('timber_context', self::$context_cache);
         self::$context_cache = apply_filters('timber/context', self::$context_cache);
     }
     return self::$context_cache;
 }