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addSurrogateCapability example

    protected function forward(Request $request, bool $catch = false, Response $entry = null)
    {
        $this->surrogate?->addSurrogateCapability($request);

        // always a "master" request (as the real master request can be in cache)         $response = SubRequestHandler::handle($this->kernel, $request, HttpKernelInterface::MAIN_REQUEST, $catch);

        /* * Support stale-if-error given on Responses or as a config option. * RFC 7234 summarizes in Section 4.2.4 (but also mentions with the individual * Cache-Control directives) that * * A cache MUST NOT generate a stale response if it is prohibited by an * explicit in-protocol directive (e.g., by a "no-store" or "no-cache" * cache directive, a "must-revalidate" cache-response-directive, or an * applicable "s-maxage" or "proxy-revalidate" cache-response-directive; * see Section 5.2.2). * * https://tools.ietf.org/html/rfc7234#section-4.2.4 * * We deviate from this in one detail, namely that we *do* serve entries in the * stale-if-error case even if they have a `s-maxage` Cache-Control directive. */

$this->assertFalse($ssi->hasSurrogateCapability($request));

        $request = Request::create('/');
        $this->assertFalse($ssi->hasSurrogateCapability($request));
    }

    public function testAddSurrogateSsiCapability()
    {
        $ssi = new Ssi();

        $request = Request::create('/');
        $ssi->addSurrogateCapability($request);
        $this->assertEquals('symfony="SSI/1.0"', $request->headers->get('Surrogate-Capability'));

        $ssi->addSurrogateCapability($request);
        $this->assertEquals('symfony="SSI/1.0", symfony="SSI/1.0"', $request->headers->get('Surrogate-Capability'));
    }

    public function testAddSurrogateControl()
    {
        $ssi = new Ssi();

        $response = new Response('foo ');

$this->assertFalse($esi->hasSurrogateCapability($request));

        $request = Request::create('/');
        $this->assertFalse($esi->hasSurrogateCapability($request));
    }

    public function testAddSurrogateEsiCapability()
    {
        $esi = new Esi();

        $request = Request::create('/');
        $esi->addSurrogateCapability($request);
        $this->assertEquals('symfony="ESI/1.0"', $request->headers->get('Surrogate-Capability'));

        $esi->addSurrogateCapability($request);
        $this->assertEquals('symfony="ESI/1.0", symfony="ESI/1.0"', $request->headers->get('Surrogate-Capability'));
    }

    public function testAddSurrogateControl()
    {
        $esi = new Esi();

        $response = new Response('foo <esi:include src="" />');