public function qualityValues()
{
return [['text/html', ['text/html']], ['audio/*; q=0.2, audio/basic', ['audio/basic', 'audio/*']], ['application/json; charset=UTF-8, text/html; q=0.8', ['application/json; charset=UTF-8', 'text/html']], ['text/plain; q=0.5, text/html, text/x-dvi; q=0.8, text/x-c', ['text/html', 'text/x-c', 'text/x-dvi', 'text/plain']], ['text/html,application/xml;q=0.9,application/xhtml+xml,*/*;q=0.8', ['text/html', 'application/xhtml+xml', 'application/xml', '*/*']], ['text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8', ['text/html', 'application/xhtml+xml', 'application/xml', '*/*']]];
}