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title: HTTP Cache Headers summary: Set the correct HTTP cache headers for your responses.
Caching Headers
By default, PHP adds caching headers that make the page appear purely dynamic. This isn't usually appropriate for most sites, even ones that are updated reasonably frequently. SilverStripe overrides the default settings with the following headers:
- The
Last-Modified
date is set to be most recent modification date of any database record queried in the generation of the page. - The
Expiry
date is set by taking the age of the page and adding that to the current time. Cache-Control
is set tomax-age=86400, must-revalidate
- Since a visitor cookie is set, the site won't be cached by proxies.
- Ajax requests are never cached.
Customizing Cache Headers
HTTP::set_cache_age
:::php
HTTP::set_cache_age(0);
Used to set the max-age component of the cache-control line, in seconds. Set it to 0 to disable caching; the "no-cache"
clause in Cache-Control
and Pragma
will be included.
HTTP::register_modification_date
:::php
HTTP::register_modification_date('2014-10-10');
Used to set the modification date to something more recent than the default. [api:DataObject::__construct] calls [api:HTTP::register_modification_date(] whenever a record comes from the database ensuring the newest date is present.