Neos\Flow\Http\Response::setLastModified PHP Метод

    public function setLastModified($date)
    {
        $this->headers->set('Last-Modified', $date);
        return $this;
    }

 /**
  * RFC 2616 / 14.25 (If-Modified-Since)
  *
  * @test
  */
 public function makeStandardsCompliantReturns304ResponseIfResourceWasNotModified()
 {
     $modifiedSince = \DateTime::createFromFormat(DATE_RFC2822, 'Sun, 20 May 2012 12:00:00 GMT');
     $lastModified = \DateTime::createFromFormat(DATE_RFC2822, 'Fr, 18 May 2012 12:00:00 GMT');
     $request = Request::create(new Uri('http://localhost'));
     $response = new Response();
     $request->setHeader('If-Modified-Since', $modifiedSince);
     $response->setLastModified($lastModified);
     $response->setContent('Some Content');
     $response->makeStandardsCompliant($request);
     $this->assertSame(304, $response->getStatusCode());
     $this->assertSame('', $response->getContent());
 }