Jarves\Controller\Admin\BackendController::loadJsAction PHP Method

    public function loadJsAction()
    {
        $assets = array();
        $md5String = '';
        $newestMTime = 0;
        $jsContent = '';
        foreach ($this->jarves->getConfigs() as $bundleConfig) {
            foreach ($bundleConfig->getAdminAssetsInfo() as $assetInfo) {
                if (!$assetInfo->isJavaScript()) {
                    continue;
                }
                if (!$assetInfo->isCompressionAllowed()) {
                    continue;
                }
                $path = $this->jarves->resolveWebPath($assetInfo->getPath());
                if (file_exists($path)) {
                    $assets[] = $assetInfo->getPath();
                    $mtime = filemtime($path);
                    $newestMTime = max($newestMTime, $mtime);
                    $md5String .= ">{$path}.{$mtime}<";
                    $content = file_get_contents($path);
                    $jsContent .= "\n/* file: {$assetInfo->getPath()} */\n{$content}\n";
                }
            }
        }
        $ifModifiedSince = $this->pageStack->getRequest()->headers->get('If-Modified-Since');
        if (isset($ifModifiedSince) && strtotime($ifModifiedSince) == $newestMTime) {
            // Client's cache IS current, so we just respond '304 Not Modified'.
            $response = new Response();
            $response->setStatusCode(304);
            $response->headers->set('Last-Modified', gmdate('D, d M Y H:i:s', $newestMTime) . ' GMT');
            return $response;
        }
        $expires = 60 * 60 * 24 * 14;
        //2 weeks
        $response = new Response();
        $response->headers->set('Content-Type', 'application/javascript');
        $response->headers->set('Pragma', 'public');
        $response->headers->set('Cache-Control', 'max-age=' . $expires);
        $response->headers->set('Expires', gmdate('D, d M Y H:i:s', time() + $expires) . ' GMT');
        //        $content = implode($files);
        $response->setContent($jsContent);
        return $response;
    }