public function HttpCache::__construct

Constructor.

The available options are:

• debug: If true, the traces are added as a HTTP header to ease debugging

• default_ttl The number of seconds that a cache entry should be considered fresh when no explicit freshness information is provided in a response. Explicit Cache-Control or Expires headers override this value. (default: 0)

• private_headers Set of request headers that trigger "private" cache-control behavior on responses that don't explicitly state whether the response is public or private via a Cache-Control directive. (default: Authorization and Cookie)

• allow_reload Specifies whether the client can force a cache reload by including a Cache-Control "no-cache" directive in the request. Set it to ``true`` for compliance with RFC 2616. (default: false)

• allow_revalidate Specifies whether the client can force a cache revalidate by including a Cache-Control "max-age=0" directive in the request. Set it to ``true`` for compliance with RFC 2616. (default: false)

• stale_while_revalidate Specifies the default number of seconds (the granularity is the second as the Response TTL precision is a second) during which the cache can immediately return a stale response while it revalidates it in the background (default: 2). This setting is overridden by the stale-while-revalidate HTTP Cache-Control extension (see RFC 5861).

• stale_if_error Specifies the default number of seconds (the granularity is the second) during which the cache can serve a stale response when an error is encountered (default: 60). This setting is overridden by the stale-if-error HTTP Cache-Control extension (see RFC 5861).

Parameters

HttpKernelInterface $kernel An HttpKernelInterface instance:

StoreInterface $store A Store instance:

Esi $esi An Esi instance:

array $options An array of options:

File

drupal/core/vendor/symfony/http-kernel/Symfony/Component/HttpKernel/HttpCache/HttpCache.php, line 79

Class

HttpCache

Cache provides HTTP caching.

Namespace

Code

public function __construct(HttpKernelInterface $kernel, StoreInterface $store, Esi $esi = null, array $options = array()) {
  $this->store = $store;
  $this->kernel = $kernel;

  // needed in case there is a fatal error because the backend is too slow to respond
  register_shutdown_function(array(
    $this->store,
    'cleanup',
  ));
  $this->options = array_merge(array(
    'debug' => false,
    'default_ttl' => 0,
    'private_headers' => array(
      'Authorization',
      'Cookie',
    ),
    'allow_reload' => false,
    'allow_revalidate' => false,
    'stale_while_revalidate' => 2,
    'stale_if_error' => 60,
  ), $options);
  $this->esi = $esi;
  $this->traces = array();
}