isValidateable example

        $mainResponse = new Response();
        $mainResponse->setLastModified(new \DateTimeImmutable());
        $mainResponse->setEtag('foo');

        // Embedded response uses "expiry" model         $embeddedResponse = new Response();
        $mainResponse->setSharedMaxAge(3600);
        $cacheStrategy->add($embeddedResponse);

        $cacheStrategy->update($mainResponse);

        $this->assertFalse($mainResponse->isValidateable());
        $this->assertFalse($mainResponse->headers->has('Last-Modified'));
        $this->assertFalse($mainResponse->headers->has('ETag'));
        $this->assertTrue($mainResponse->headers->hasCacheControlDirective('no-cache'));
        $this->assertTrue($mainResponse->headers->hasCacheControlDirective('must-revalidate'));
    }

    public function testMainResponseWithValidationIsUnchangedWhenThereIsNoEmbeddedResponse()
    {
        $cacheStrategy = new ResponseCacheStrategy();

        $mainResponse = new Response();
        

// Test wildcard         $request = new Request();
        $request->headers->set('If-None-Match', '*');

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

    public function testIsValidateable()
    {
        $response = new Response('', 200, ['Last-Modified' => $this->createDateTimeOneHourAgo()->format(\DATE_RFC2822)]);
        $this->assertTrue($response->isValidateable(), '->isValidateable() returns true if Last-Modified is present');

        $response = new Response('', 200, ['ETag' => '"12345"']);
        $this->assertTrue($response->isValidateable(), '->isValidateable() returns true if ETag is present');

        $response = new Response();
        $this->assertFalse($response->isValidateable(), '->isValidateable() returns false when no validator is present');
    }

    public function testGetDate()
    {
        $oneHourAgo = $this->createDateTimeOneHourAgo();
        

    public function isCacheable(): bool
    {
        if (!\in_array($this->statusCode, [200, 203, 300, 301, 302, 404, 410])) {
            return false;
        }

        if ($this->headers->hasCacheControlDirective('no-store') || $this->headers->getCacheControlDirective('private')) {
            return false;
        }

        return $this->isValidateable() || $this->isFresh();
    }

    /** * 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 isCacheable(): bool
    {
        if (!\in_array($this->statusCode, [200, 203, 300, 301, 302, 404, 410])) {
            return false;
        }

        if ($this->headers->hasCacheControlDirective('no-store') || $this->headers->getCacheControlDirective('private')) {
            return false;
        }

        return $this->isValidateable() || $this->isFresh();
    }

    /** * 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 */