Add support for Sec-Purpose header (#48925)

Author: nanos

src/Illuminate/Http/Request.php

@@ -297,7 +297,8 @@ public function pjax()
     public function prefetch()
     {
         return strcasecmp($this->server->get('HTTP_X_MOZ') ?? '', 'prefetch') === 0 ||
-               strcasecmp($this->headers->get('Purpose') ?? '', 'prefetch') === 0;
+               strcasecmp($this->headers->get('Purpose') ?? '', 'prefetch') === 0 ||
+               strcasecmp($this->headers->get('Sec-Purpose') ?? '', 'prefetch') === 0;
     }
 
     /**

tests/Http/HttpRequestTest.php

@@ -254,6 +254,15 @@ public function testPrefetchMethod()
         $this->assertTrue($request->prefetch());
         $request->headers->set('Purpose', 'Prefetch');
         $this->assertTrue($request->prefetch());
+
+        $request->headers->remove('Purpose');
+
+        $request->headers->set('Sec-Purpose', '');
+        $this->assertFalse($request->prefetch());
+        $request->headers->set('Sec-Purpose', 'prefetch');
+        $this->assertTrue($request->prefetch());
+        $request->headers->set('Sec-Purpose', 'Prefetch');
+        $this->assertTrue($request->prefetch());
     }
 
     public function testPjaxMethod()