@Cache

@Cache

The @Cache annotation makes it easy to define HTTP caching headers for expiration and validation.

HTTP Expiration Strategies

The @Cache annotation makes it easy to define HTTP caching:

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use Sensio\Bundle\FrameworkExtraBundle\Configuration\Cache;

/**
 * @Cache(expires="tomorrow", public=true)
 */
public function indexAction()
{
}

You can also use the annotation on a class to define caching for all actions of a controller:

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/**
 * @Cache(expires="tomorrow", public=true)
 */
class BlogController extends Controller
{
}

When there is a conflict between the class configuration and the method configuration, the latter overrides the former:

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/**
 * @Cache(expires="tomorrow")
 */
class BlogController extends Controller
{
    /**
     * @Cache(expires="+2 days")
     */
    public function indexAction()
    {
    }
}

Note

The expires attribute takes any valid date understood by the PHP strtotime() function.

HTTP Validation Strategies

The lastModified and ETag attributes manages the HTTP validation cache headers. lastModified adds a Last-Modified header to Responses and ETag adds an ETag header.

Both automatically trigger the logic to return a 304 response when the response is not modified (in this case, the controller is not called):

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use Sensio\Bundle\FrameworkExtraBundle\Configuration\Cache;

/**
 * @Cache(lastModified="post.getUpdatedAt()", ETag="'Post' ~ post.getId() ~ post.getUpdatedAt()")
 */
public function indexAction(Post $post)
{
    // your code
    // won't be called in case of a 304
}

It's roughly doing the same as the following code:

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public function myAction(Request $request, Post $post)
{
    $response = new Response();
    $response->setLastModified($post->getUpdatedAt());
    if ($response->isNotModified($request)) {
        return $response;
    }

    // your code
}

Note

The ETag HTTP header value is the result of the expression hashed with the sha256 algorithm.

Attributes

Here is a list of accepted attributes and their HTTP header equivalent:

Annotation Response Method
@Cache(expires="tomorrow") $response->setExpires()
@Cache(smaxage="15") $response->setSharedMaxAge()
@Cache(maxage="15") $response->setMaxAge()
@Cache(vary={"Cookie"}) $response->setVary()
@Cache(public=true) $response->setPublic()
@Cache(lastModified="post.getUpdatedAt()") $response->setLastModified()
@Cache(ETag="post.getId() ~ post.getUpdatedAt()") $response->setETag()

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