private function buildGetUrl($url, array $query = [])
    {
        // Merge global and request queries
        $query = array_merge(
            Arr::get($this->config, 'query', []),
            $query
        );

        // Append query
        if ($query = http_build_query($query)) {
            $url .= strpos($url, '?') ? $query : "?{$query}";
        }

        return $url;
    }