Function "thumbnail" in Assets.php $this->app->request->headers['Accept'] is not working

[yjmtmtk]

This would work.

public function thumbnail($id = null) {

        $this->helper('session')->close();

        $mime = $this->param('mime', 'auto');

        if ($mime == 'auto') {

            $mime = null;

            //if (strpos($this->app->request->headers['Accept'] ?? '', 'image/webp') !== false) {
            if (strpos($_SERVER['HTTP_ACCEPT'] ?? '', 'image/webp') !== false) {
                $gdinfo = \gd_info();
                $mime = isset($gdinfo['WebP Support']) && $gdinfo['WebP Support'] ? 'webp' : null;
            }
        }

        $src = $this->param('src', $id);

        $options = [
            'src' => $src,
            'fp' => $this->param('fp', null),
            'mode' => $this->param('m', 'thumbnail'),
            'mime' => $mime,
            'filters' => (array) $this->param('f', []),
            'width' => intval($this->param('w', null)),
            'height' => intval($this->param('h', null)),
            'quality' => intval($this->param('q', 30)),
            'rebuild' => intval($this->param('r', false)),
            'timestamp' => $this->param('t', null),
        ];

        $thumbUrl = $this->helper('asset')->image($options);

        if (!$thumbUrl || isset($thumbUrl['error'])) {
            return false;
        }

        if($this->param('re:int', 1)) {
            $this->app->reroute($thumbUrl);
        }

        return ['url' => $thumbUrl];
    }