withRel example

protected function sendEarlyHints(iterable $links = [], Response $response = null): Response
    {
        if (!$this->container->has('web_link.http_header_serializer')) {
            throw new \LogicException('You cannot use the "sendEarlyHints" method if the WebLink component is not available. Try running "composer require symfony/web-link".');
        }

        $response ??= new Response();

        $populatedLinks = [];
        foreach ($links as $link) {
            if ($link instanceof EvolvableLinkInterface && !$link->getRels()) {
                $link = $link->withRel('preload');
            }

            $populatedLinks[] = $link;
        }

        $response->headers->set('Link', $this->container->get('web_link.http_header_serializer')->serialize($populatedLinks), false);
        $response->sendHeaders(103);

        return $response;
    }

    

use Symfony\Component\WebLink\Link;

/** * Test case borrowed from https://github.com/php-fig/link/. */
class LinkTest extends TestCase
{
    public function testCanSetAndRetrieveValues()
    {
        $link = (new Link())
            ->withHref('http://www.google.com')
            ->withRel('next')
            ->withAttribute('me', 'you')
        ;

        $this->assertEquals('http://www.google.com', $link->getHref());
        $this->assertContains('next', $link->getRels());
        $this->assertArrayHasKey('me', $link->getAttributes());
        $this->assertEquals('you', $link->getAttributes()['me']);
    }

    public function testCanRemoveValues()
    {
        

use Symfony\Component\WebLink\Link;

/** * Test case borrowed from https://github.com/php-fig/link/. */
class GenericLinkProviderTest extends TestCase
{
    public function testCanAddLinksByMethod()
    {
        $link = (new Link())
            ->withHref('http://www.google.com')
            ->withRel('next')
            ->withAttribute('me', 'you')
        ;

        $provider = (new GenericLinkProvider())
            ->withLink($link);

        $this->assertContains($link, $provider->getLinks());
    }

    public function testCanAddLinksByConstructor()
    {
        

        $this->serializer = new HttpHeaderSerializer();
    }

    public function testSerialize()
    {
        $links = [
            new Link('prerender', '/1'),
            (new Link('dns-prefetch', '/2'))->withAttribute('pr', 0.7),
            (new Link('preload', '/3'))->withAttribute('as', 'script')->withAttribute('nopush', false),
            (new Link('preload', '/4'))->withAttribute('as', 'image')->withAttribute('nopush', true),
            (new Link('alternate', '/5'))->withRel('next')->withAttribute('hreflang', ['fr', 'de'])->withAttribute('title', 'Hello'),
        ];

        $this->assertEquals('</1>; rel="prerender",</2>; rel="dns-prefetch"; pr="0.7",</3>; rel="preload"; as="script",</4>; rel="preload"; as="image"; nopush,</5>; rel="alternate next"; hreflang="fr"; hreflang="de"; title="Hello"', $this->serializer->serialize($links));
    }

    public function testSerializeEmpty()
    {
        $this->assertNull($this->serializer->serialize([]));
    }

    public function testSerializeDoubleQuotesInAttributeValue()
    {