public function getHeaders()
{
$meta = $this->parser->meta;
$headers = [];
foreach ($meta as $provider) {
if ($this->parser->envelope) {
$headers[strtolower(str_replace('-', '_', preg_replace('/^Meta-/', '', $provider->getTitle())))] = $provider->get();
} else {
$headers[$provider->getTitle()] = $provider->get();
}
}
return $headers;
}