[HttpFoundation] Fix Expires response header for EventStream

Author: 4513

EventStreamResponse.php

@@ -48,7 +48,7 @@ public function __construct(?callable $callback = null, int $status = 200, array
             'Cache-Control' => 'private, no-cache, no-store, must-revalidate, max-age=0',
             'X-Accel-Buffering' => 'no',
             'Pragma' => 'no-cache',
-            'Expire' => '0',
+            'Expires' => '0',
         ];
 
         parent::__construct($callback, $status, $headers);

Tests/EventStreamResponseTest.php

@@ -29,6 +29,14 @@ public function testInitializationWithDefaultValues()
         $this->assertNull($response->getRetry());
     }
 
+    public function testPresentOfExpiresHeader()
+    {
+        $response = new EventStreamResponse();
+
+        $this->assertTrue($response->headers->has('Expires'));
+        $this->assertSame('0', $response->headers->get('Expires'));
+    }
+
     public function testStreamSingleEvent()
     {
         $response = new EventStreamResponse(function () {