use link parameter of operation instead of header parameter of ApiResource

Author: aaa2000

src/State/Processor/AddLinkHeaderProcessor.php

@@ -52,8 +52,7 @@ public function process(mixed $data, Operation $operation, array $uriVariables =
         // We add our header here as Symfony does it only for the main Request and we want it to be done on errors (sub-request) as well
         $linksProvider = $request->attributes->get('_api_platform_links');
         if ($this->serializer && ($links = $linksProvider?->getLinks())) {
-            $linkHeader = implode(',', array_filter([$this->serializer->serialize($links), $response->headers->get('Link')]));
-            $response->headers->set('Link', '' === $linkHeader ? null : $linkHeader);
+            $response->headers->set('Link', $this->serializer->serialize($links));
         }
         $this->stopwatch?->stop('api_platform.processor.add_link_header');
 

tests/Fixtures/TestBundle/ApiResource/DeprecationHeader.php

@@ -16,15 +16,20 @@
 use ApiPlatform\Metadata\ApiProperty;
 use ApiPlatform\Metadata\ApiResource;
 use ApiPlatform\Metadata\GetCollection;
+use Symfony\Component\WebLink\Link;
 
 #[ApiResource(
-    operations: [new GetCollection(provider: [self::class, 'provide'])],
-    deprecationReason: 'This API is deprecated ',
-    headers: [
-        'deprecation' => '@1688169599',
-        'sunset' => 'Sun, 30 Jun 2024 23:59:59 UTC',
-        'link' => '<https://developer.example.com/deprecation>; rel="deprecation"; type="text/html"',
-    ],
+    operations: [new GetCollection(
+        headers: [
+            'deprecation' => '@1688169599',
+            'sunset' => 'Sun, 30 Jun 2024 23:59:59 UTC',
+        ],
+        links: [
+            new Link('deprecation', 'https://developer.example.com/deprecation'),
+        ],
+        deprecationReason: 'This API is deprecated',
+        provider: [self::class, 'provide'],
+    )],
 )]
 class DeprecationHeader
 {

tests/Functional/DeprecationHeaderTest.php

@@ -39,6 +39,6 @@ public function testDeprecationHeader(): void
 
         $this->assertContains('@1688169599', $headers['deprecation']);
         $this->assertContains('Sun, 30 Jun 2024 23:59:59 UTC', $headers['sunset']);
-        $this->assertStringContainsString('<https://developer.example.com/deprecation>; rel="deprecation"; type="text/html"', $headers['link'][0]);
+        $this->assertStringContainsString('<https://developer.example.com/deprecation>; rel="deprecation"', $headers['link'][0]);
     }
 }