…k() (dunglas)This PR was squashed before being merged into the 4.2-dev branch (closes #28875).Discussion----------[FWBundle] Add a new method AbstractController::addLink()| Q             | A| ------------- | ---| Branch?       | master| Bug fix?      |no| New feature?  | yes <!-- don't forget to update src/**/CHANGELOG.md files -->| BC breaks?    | no     <!-- seehttps://symfony.com/bc -->| Deprecations? | no <!-- don't forget to update UPGRADE-*.md and src/**/CHANGELOG.md files -->| Tests pass?   | yes    <!-- please add some, will be required by reviewers -->| Fixed tickets | n/a   <!-- #-prefixed issue number(s), if any -->| License       | MIT| Doc PR        | todoThis provides a convenient method to add `Link` headers to the current `Response` directly from the `Request` object.It improves the developer experience and the discoverability of [the WebLink component](symfony/symfony-docs#10309).Usage:```phpnamespace App\Controller;use Fig\Link\Link;use Symfony\Component\HttpFoundation\Request;use Symfony\Component\HttpFoundation\Response;use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;class MyAction extends AbstractController{    public function __invoke(Request $request): Response    {        $this->addLink($request, new Link('mercure', 'https://demo.mercure.rocks'));        return $this->json(['foo' => 'bar']);    }}```Commits-------4d20c39f70 [FWBundle] Add a new method AbstractController::addLink()

…k() (dunglas)This PR was squashed before being merged into the 4.2-dev branch (closes#28875).Discussion----------[FWBundle] Add a new method AbstractController::addLink()| Q             | A| ------------- | ---| Branch?       | master| Bug fix?      |no| New feature?  | yes <!-- don't forget to update src/**/CHANGELOG.md files -->| BC breaks?    | no     <!-- seehttps://symfony.com/bc -->| Deprecations? | no <!-- don't forget to update UPGRADE-*.md and src/**/CHANGELOG.md files -->| Tests pass?   | yes    <!-- please add some, will be required by reviewers -->| Fixed tickets | n/a   <!-- #-prefixed issue number(s), if any -->| License       | MIT| Doc PR        | todoThis provides a convenient method to add `Link` headers to the current `Response` directly from the `Request` object.It improves the developer experience and the discoverability of [the WebLink component](symfony/symfony-docs#10309).Usage:```phpnamespace App\Controller;use Fig\Link\Link;use Symfony\Component\HttpFoundation\Request;use Symfony\Component\HttpFoundation\Response;use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;class MyAction extends AbstractController{    public function __invoke(Request $request): Response    {        $this->addLink($request, new Link('mercure', 'https://demo.mercure.rocks'));        return $this->json(['foo' => 'bar']);    }}```Commits-------4d20c39 [FWBundle] Add a new method AbstractController::addLink()

This PR was merged into the 3.4 branch.Discussion----------Add docs for the WebLink componentThe WebLink component is available since Symfony 3.3, but I never took the time to add the docs (however, a blog post explaining how to use it was available).This documentation is based onhttps://dunglas.fr/2017/10/symfony-4-http2-push-and-preloading/.If necessary, I can grant any copyright regarding this post to the Symfony project.symfony/symfony#21478symfony/symfony#22273Closes#7515.Commits-------91ee3bc Fix RSTea7b3da@nicolas-grekas' review38fda88 fix builde12e776 RST088690f Fix linke3d4036 RST178821e refactor9f4ae9b fix typo6beb4eb Add docs for the WebLink component