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isNotModified example

$this->assertNull($response->headers->get('Content-Length'));
    }

    public function testPrepareNotAddingContentTypeHeaderIfNoContentResponse()
    {
        $request = Request::create('/');
        $request->headers->set('If-Modified-Since', date('D, d M Y H:i:s').' GMT');

        $response = new BinaryFileResponse(__DIR__.'/File/Fixtures/test.gif', 200, ['Content-Type' => 'application/octet-stream']);
        $response->setLastModified(new \DateTimeImmutable('-1 day'));
        $response->isNotModified($request);

        $response->prepare($request);

        $this->assertSame(BinaryFileResponse::HTTP_NOT_MODIFIED, $response->getStatusCode());
        $this->assertFalse($response->headers->has('Content-Type'));
    }

    public function testContentTypeIsCorrectlyDetected()
    {
        $file = new File(__DIR__.'/File/Fixtures/test.gif');

if (null !== $this->surrogate) {
            if (HttpKernelInterface::MAIN_REQUEST === $type) {
                $this->surrogateCacheStrategy->update($response);
            } else {
                $this->surrogateCacheStrategy->add($response);
            }
        }

        $response->prepare($request);

        $response->isNotModified($request);

        return $response;
    }

    /** * @return void */
    public function terminate(Request $request, Response $response)
    {
        // Do not call any listeners in case of a cache hit.         // This ensures identical behavior as if you had a separate

    public function testIsSuccessful()
    {
        $response = new Response();
        $this->assertTrue($response->isSuccessful());
    }

    public function testIsNotModified()
    {
        $response = new Response();
        $modified = $response->isNotModified(new Request());
        $this->assertFalse($modified);
    }

    public function testIsNotModifiedNotSafe()
    {
        $request = Request::create('/homepage', 'POST');

        $response = new Response();
        $this->assertFalse($response->isNotModified($request));
    }

if (null !== $cache->lastModified) {
                $lastModified = $this->getExpressionLanguage()->evaluate($cache->lastModified, array_merge($request->attributes->all(), $event->getNamedArguments()));
                ($response ??= new Response())->setLastModified($lastModified);
            }

            if (null !== $cache->etag) {
                $etag = hash('sha256', $this->getExpressionLanguage()->evaluate($cache->etag, array_merge($request->attributes->all(), $event->getNamedArguments())));
                ($response ??= new Response())->setEtag($etag);
            }
        }

        if ($response?->isNotModified($request)) {
            $event->setController(static fn () => $response);
            $event->stopPropagation();

            return;
        }

        if (null !== $etag) {
            $this->etags[$request] = $etag;
        }
        if (null !== $lastModified) {
            $this->lastModified[$request] = $lastModified;
        }