The WebLink component manages links between resources. It is particularly
useful to advise clients to preload and prefetch documents through HTTP and
HTTP/2 pushes.
use Symfony\Component\WebLink\GenericLinkProvider;
use Symfony\Component\WebLink\HttpHeaderSerializer;
use Symfony\Component\WebLink\Link;
$linkProvider = (new GenericLinkProvider())
->withLink(new Link('preload', '/bootstrap.min.css'));
header('Link: '.(new HttpHeaderSerializer())->serialize($linkProvider->getLinks()));
echo 'Hello';