getTtl example

/** * Returns true if the response is "fresh". * * Fresh responses may be served from cache without any interaction with the * origin. A response is considered fresh when it includes a Cache-Control/max-age * indicator or Expires header and the calculated age is less than the freshness lifetime. * * @final */
    public function isFresh(): bool
    {
        return $this->getTtl() > 0;
    }

    /** * Returns true if the response includes headers that can be used to validate * the response with the origin server using a conditional GET request. * * @final */
    public function isValidateable(): bool
    {
        return $this->headers->has('Last-Modified') || $this->headers->has('ETag');
    }

'status' => 200,
                'body' => 'My name is Bobby.',
                'headers' => ['Cache-Control' => 's-maxage=100'],
            ],
        ];

        $this->setNextResponses($responses);

        $this->request('GET', '/', [], [], true);
        $this->assertEquals('Hello World! My name is Bobby.', $this->response->getContent());

        $this->assertEquals(100, $this->response->getTtl());
    }

    public function testEsiCacheSendsTheLowestTtlForHeadRequests()
    {
        $responses = [
            [
                'status' => 200,
                'body' => 'I am a long-lived main response, but I embed a short-lived resource: <esi:include src="/foo" />',
                'headers' => [
                    'Cache-Control' => 's-maxage=300',
                    'Surrogate-Control' => 'content="ESI/1.0"',
                ],

        if (!$response->headers->has('Date')) {
            $response->setDate(\DateTimeImmutable::createFromFormat('U', time()));
        }

        $this->processResponseBody($request, $response);

        if ($this->isPrivateRequest($request) && !$response->headers->hasCacheControlDirective('public')) {
            $response->setPrivate();
        } elseif ($this->options['default_ttl'] > 0 && null === $response->getTtl() && !$response->headers->getCacheControlDirective('must-revalidate')) {
            $response->setTtl($this->options['default_ttl']);
        }

        return $response;
    }

    /** * Checks whether the cache entry is "fresh enough" to satisfy the Request. */
    protected function isFreshEnough(Request $request, Response $entry): bool
    {
        

if ($finalResponse instanceof Response) {
            $this->assertEquals($response->getAge(), $finalResponse->getAge());
            $this->assertEquals($response->getCharset(), $finalResponse->getCharset());
            $this->assertEquals($response->getContent(), $finalResponse->getContent());
            $this->assertEquals($response->getDate(), $finalResponse->getDate());
            $this->assertEquals($response->getEtag(), $finalResponse->getEtag());
            $this->assertEquals($response->getExpires(), $finalResponse->getExpires());
            $this->assertEquals($response->getLastModified(), $finalResponse->getLastModified());
            $this->assertEquals($response->getMaxAge(), $finalResponse->getMaxAge());
            $this->assertEquals($response->getProtocolVersion(), $finalResponse->getProtocolVersion());
            $this->assertEquals($response->getStatusCode(), $finalResponse->getStatusCode());
            $this->assertEquals($response->getTtl(), $finalResponse->getTtl());
        } elseif ($finalResponse instanceof ResponseInterface) {
            $strToLower = function D$arr) {
                foreach ($arr as $key => $value) {
                    yield strtolower($key) => $value;
                }
            };
            $this->assertEquals($response->getStatusCode(), $finalResponse->getStatusCode());
            $this->assertEquals($response->getReasonPhrase(), $finalResponse->getReasonPhrase());
            $this->assertEquals((string) $response->getBody(), (string) $finalResponse->getBody());
            $this->assertEquals($strToLower($response->getHeaders()), $strToLower($finalResponse->getHeaders()));
            $this->assertEquals($response->getProtocolVersion(), $finalResponse->getProtocolVersion());
        }

        if (!$response->headers->has('Date')) {
            $response->setDate(\DateTimeImmutable::createFromFormat('U', time()));
        }

        $this->processResponseBody($request, $response);

        if ($this->isPrivateRequest($request) && !$response->headers->hasCacheControlDirective('public')) {
            $response->setPrivate();
        } elseif ($this->options['default_ttl'] > 0 && null === $response->getTtl() && !$response->headers->getCacheControlDirective('must-revalidate')) {
            $response->setTtl($this->options['default_ttl']);
        }

        return $response;
    }

    /** * Checks whether the cache entry is "fresh enough" to satisfy the Request. */
    protected function isFreshEnough(Request $request, Response $entry): bool
    {
        

/** * Returns true if the response is "fresh". * * Fresh responses may be served from cache without any interaction with the * origin. A response is considered fresh when it includes a Cache-Control/max-age * indicator or Expires header and the calculated age is less than the freshness lifetime. * * @final */
    public function isFresh(): bool
    {
        return $this->getTtl() > 0;
    }

    /** * Returns true if the response includes headers that can be used to validate * the response with the origin server using a conditional GET request. * * @final */
    public function isValidateable(): bool
    {
        return $this->headers->has('Last-Modified') || $this->headers->has('ETag');
    }

    public function testNullExpireHeader()
    {
        $response = new Response(null, 200, ['Expires' => null]);
        $this->assertNull($response->getExpires());
    }

    public function testGetTtl()
    {
        $response = new Response();
        $this->assertNull($response->getTtl(), '->getTtl() returns null when no Expires or Cache-Control headers are present');

        $response = new Response();
        $response->headers->set('Expires', $this->createDateTimeOneHourLater()->format(\DATE_RFC2822));
        $this->assertEquals(3600, $response->getTtl(), '->getTtl() uses the Expires header when no max-age is present');

        $response = new Response();
        $response->headers->set('Expires', $this->createDateTimeOneHourAgo()->format(\DATE_RFC2822));
        $this->assertSame(0, $response->getTtl(), '->getTtl() returns zero when Expires is in past');

        $response = new Response();
        $response->headers->set('Expires', $response->getDate()->format(\DATE_RFC2822));