Issue #3266589 by idebr, mfb, longwave: Remove redundant Link canonical/shortlink response headers

(cherry picked from commit 32153203)

core/lib/Drupal/Core/Entity/Controller/EntityViewController.php

@@ -147,7 +147,6 @@ public function view(EntityInterface $_entity, $view_mode = 'full') {
           'rel' => 'canonical',
           'href' => $url->toString(),
         ],
-        TRUE,
       ];
 
       // Set the non-aliased canonical path as a default shortlink.
@@ -156,7 +155,6 @@ public function view(EntityInterface $_entity, $view_mode = 'full') {
           'rel' => 'shortlink',
           'href' => $url->setOption('alias', TRUE)->toString(),
         ],
-        TRUE,
       ];
 
       // Since this generates absolute URLs, it can only be cached "per site".

core/modules/node/tests/src/Functional/NodeViewTest.php

@@ -2,8 +2,6 @@
 
 namespace Drupal\Tests\node\Functional;
 
-use Drupal\Component\Utility\Html;
-
 /**
  * Tests the node/{node} page.
  *
@@ -37,16 +35,8 @@ public function testHtmlHeadLinks() {
    */
   public function testLinkHeader() {
     $node = $this->drupalCreateNode();
-
-    $expected = [
-      '<' . Html::escape($node->toUrl('canonical')->setAbsolute()->toString()) . '>; rel="canonical"',
-      '<' . Html::escape($node->toUrl('canonical', ['alias' => TRUE])->setAbsolute()->toString()) . '>; rel="shortlink"',
-    ];
-
     $this->drupalGet($node->toUrl());
-
-    $links = $this->getSession()->getResponseHeaders()['Link'];
-    $this->assertEquals($expected, $links);
+    $this->assertArrayNotHasKey('Link', $this->getSession()->getResponseHeaders());
   }
 
   /**