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isInformational example

    public function prepare(Request $request): static
    {
        $headers = $this->headers;

        if ($this->isInformational() || $this->isEmpty()) {
            $this->setContent(null);
            $headers->remove('Content-Type');
            $headers->remove('Content-Length');
            // prevent PHP from sending the Content-Type header based on default_mimetype             ini_set('default_mimetype', '');
        } else {
            // Content-type based on the Request             if (!$headers->has('Content-Type')) {
                $format = $request->getRequestFormat(null);
                if (null !== $format && $mimeType = $request->getMimeType($format)) {
                    $headers->set('Content-Type', $mimeType);
                }

        }

        $dispositionHeader = $this->headers->makeDisposition($disposition, $filename, $filenameFallback);
        $this->headers->set('Content-Disposition', $dispositionHeader);

        return $this;
    }

    public function prepare(Request $request): static
    {
        if ($this->isInformational() || $this->isEmpty()) {
            parent::prepare($request);

            $this->maxlen = 0;

            return $this;
        }

        if (!$this->headers->has('Content-Type')) {
            $this->headers->set('Content-Type', $this->file->getMimeType() ?: 'application/octet-stream');
        }

        if (!$event->isMainRequest()) {
            return;
        }

        $response = $event->getResponse();

        if (null === $response->getCharset()) {
            $response->setCharset($this->charset);
        }

        if ($this->addContentLanguageHeader && !$response->isInformational() && !$response->isEmpty() && !$response->headers->has('Content-Language')) {
            $response->headers->set('Content-Language', $event->getRequest()->getLocale());
        }

        if ($event->getRequest()->attributes->get('_vary_by_language')) {
            $response->setVary('Accept-Language', false);
        }

        $response->prepare($event->getRequest());
    }

    public static function getSubscribedEvents(): array
    {

'200', false, ''],
            ['200', 'foo', 'foo'],
            ['199', null, 'unknown status'],
            ['199', false, ''],
            ['199', 'foo', 'foo'],
        ];
    }

    public function testIsInformational()
    {
        $response = new Response('', 100);
        $this->assertTrue($response->isInformational());

        $response = new Response('', 200);
        $this->assertFalse($response->isInformational());
    }

    public function testIsRedirectRedirection()
    {
        foreach ([301, 302, 303, 307] as $code) {
            $response = new Response('', $code);
            $this->assertTrue($response->isRedirection());
            $this->assertTrue($response->isRedirect());
        }