129 lines
3.7 KiB
ReStructuredText
129 lines
3.7 KiB
ReStructuredText
HTTP Cache
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==========
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The *HttpCacheServiceProvider* provides support for the Symfony Reverse
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Proxy.
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Parameters
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----------
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* **http_cache.cache_dir**: The cache directory to store the HTTP cache data.
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* **http_cache.options** (optional): An array of options for the `HttpCache
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<http://api.symfony.com/master/Symfony/Component/HttpKernel/HttpCache/HttpCache.html>`_
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constructor.
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Services
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--------
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* **http_cache**: An instance of `HttpCache
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<http://api.symfony.com/master/Symfony/Component/HttpKernel/HttpCache/HttpCache.html>`_.
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* **http_cache.esi**: An instance of `Esi
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<http://api.symfony.com/master/Symfony/Component/HttpKernel/HttpCache/Esi.html>`_,
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that implements the ESI capabilities to Request and Response instances.
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* **http_cache.store**: An instance of `Store
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<http://api.symfony.com/master/Symfony/Component/HttpKernel/HttpCache/Store.html>`_,
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that implements all the logic for storing cache metadata (Request and Response
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headers).
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Registering
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-----------
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.. code-block:: php
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$app->register(new Silex\Provider\HttpCacheServiceProvider(), array(
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'http_cache.cache_dir' => __DIR__.'/cache/',
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));
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Usage
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-----
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Silex already supports any reverse proxy like Varnish out of the box by
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setting Response HTTP cache headers::
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use Symfony\Component\HttpFoundation\Response;
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$app->get('/', function() {
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return new Response('Foo', 200, array(
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'Cache-Control' => 's-maxage=5',
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));
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});
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.. tip::
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If you want Silex to trust the ``X-Forwarded-For*`` headers from your
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reverse proxy at address $ip, you will need to whitelist it as documented
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in `Trusting Proxies
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<http://symfony.com/doc/current/components/http_foundation/trusting_proxies.html>`_.
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If you would be running Varnish in front of your application on the same machine::
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use Symfony\Component\HttpFoundation\Request;
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Request::setTrustedProxies(array('127.0.0.1', '::1'));
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$app->run();
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This provider allows you to use the Symfony reverse proxy natively with
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Silex applications by using the ``http_cache`` service. The Symfony reverse proxy
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acts much like any other proxy would, so you will want to whitelist it::
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use Symfony\Component\HttpFoundation\Request;
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Request::setTrustedProxies(array('127.0.0.1'));
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$app['http_cache']->run();
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The provider also provides ESI support::
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$app->get('/', function() {
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$response = new Response(<<<EOF
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<html>
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<body>
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Hello
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<esi:include src="/included" />
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</body>
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</html>
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EOF
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, 200, array(
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'Surrogate-Control' => 'content="ESI/1.0"',
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));
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$response->setTtl(20);
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return $response;
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});
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$app->get('/included', function() {
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$response = new Response('Foo');
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$response->setTtl(5);
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return $response;
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});
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$app['http_cache']->run();
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If your application doesn't use ESI, you can disable it to slightly improve the
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overall performance::
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$app->register(new Silex\Provider\HttpCacheServiceProvider(), array(
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'http_cache.cache_dir' => __DIR__.'/cache/',
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'http_cache.esi' => null,
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));
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.. tip::
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To help you debug caching issues, set your application ``debug`` to true.
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Symfony automatically adds a ``X-Symfony-Cache`` header to each response
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with useful information about cache hits and misses.
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If you are *not* using the Symfony Session provider, you might want to set
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the PHP ``session.cache_limiter`` setting to an empty value to avoid the
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default PHP behavior.
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Finally, check that your Web server does not override your caching strategy.
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For more information, consult the `Symfony HTTP Cache documentation
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<http://symfony.com/doc/current/book/http_cache.html>`_.
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