getVary example

$this->assertFalse($this->response->headers->hasCacheControlDirective('public'));
        $this->assertTrue($this->response->headers->hasCacheControlDirective('private'));
    }

    public function testResponseVary()
    {
        $vary = ['foobar'];
        $request = $this->createRequest(new Cache(vary: $vary));

        $this->listener->onKernelResponse($this->createEventMock($request, $this->response));
        $this->assertTrue($this->response->hasVary());
        $result = $this->response->getVary();
        $this->assertSame($vary, $result);
    }

    public function testResponseVaryWhenVaryNotSet()
    {
        $request = $this->createRequest(new Cache());
        $vary = ['foobar'];
        $this->response->setVary($vary);

        $this->listener->onKernelResponse($this->createEventMock($request, $this->response));
        $this->assertTrue($this->response->hasVary());
        

$this->assertEquals('1.0', $response->getProtocolVersion());

        $response->setProtocolVersion('1.1');

        $this->assertEquals('1.1', $response->getProtocolVersion());
    }

    public function testGetVary()
    {
        $response = new Response();
        $this->assertEquals([], $response->getVary(), '->getVary() returns an empty array if no Vary header is present');

        $response = new Response();
        $response->headers->set('Vary', 'Accept-Language');
        $this->assertEquals(['Accept-Language'], $response->getVary(), '->getVary() parses a single header name value');

        $response = new Response();
        $response->headers->set('Vary', 'Accept-Language User-Agent X-Foo');
        $this->assertEquals(['Accept-Language', 'User-Agent', 'X-Foo'], $response->getVary(), '->getVary() parses multiple header name values separated by spaces');

        $response = new Response();
        $response->headers->set('Vary', 'Accept-Language,User-Agent, X-Foo');
        

    else {
      $response = $this->fetch($request, $type, $catch);
    }

    // Only allow caching in the browser and prevent that the response is stored     // by an external proxy server when the following conditions apply:     // 1. There is a session cookie on the request.     // 2. The Vary: Cookie header is on the response.     // 3. The Cache-Control header does not contain the no-cache directive.     if ($request->cookies->has(session_name()) &&
      in_array('Cookie', $response->getVary()) &&
      !$response->headers->hasCacheControlDirective('no-cache')) {

      $response->setPrivate();
    }

    // Perform HTTP revalidation.     // @todo Use Response::isNotModified() as     // per https://www.drupal.org/node/2259489.     $last_modified = $response->getLastModified();
    if ($last_modified) {
      // See if the client has provided the required HTTP headers.