New in Symfony 4.2: addLink() shortcut
November 5, 2018
•
Published by
Javier Eguiluz
Warning: This post is about an unsupported Symfony version. Some of this information may be out of date. Read the most recent Symfony Docs.
The WebLink component introduced in Symfony 3.3 provides tools to manage the
Link HTTP header needed for Web Linking when using HTTP/2 Server Push
as well as Resource Hints. In practice, it can improve the performance of
your web apps dramatically.
In order to simplify its usage, in Symfony 4.2 we've added a new addLink()
shortcut to AbstractController. For example, this is how you can preload a
CSS file (to send it before the browser requests it):
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// src/Controller/BlogController.php
namespace App\Controller;
use Fig\Link\GenericLinkProvider;
use Fig\Link\Link;
use Symfony\Component\HttpFoundation\Request;
use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;
class BlogController extends AbstractController
{
public function index(Request $request)
{
// BEFORE
$linkProvider = $request->attributes->get('_links', new GenericLinkProvider());
$request->attributes->set('_links', $linkProvider->withLink(new Link('preload', '/app.css')));
// AFTER
$this->addLink($request, new Link('preload', '/app.css'));
return $this->render('...');
}
}Help the Symfony project!
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