Barryvdh\Debugbar\LaravelDebugbar::isJsonRequest PHP Метод

    protected function isJsonRequest(Request $request)
    {
        // If XmlHttpRequest, return true
        if ($request->isXmlHttpRequest()) {
            return true;
        }
        // Check if the request wants Json
        $acceptable = $request->getAcceptableContentTypes();
        return isset($acceptable[0]) && $acceptable[0] == 'application/json';
    }