Neos\Flow\Tests\Unit\Http\HeadersTest::headerFieldsCanExistMultipleTimes PHP Method

    public function headerFieldsCanExistMultipleTimes()
    {
        $headers = new Headers();
        $headers->set('X-Powered-By', 'Flow');
        $headers->set('X-Powered-By', 'Neos', false);
        $this->assertSame(['Flow', 'Neos'], $headers->get('X-Powered-By'));
    }