Cache and deliver pages

How pages are cached and delivered on Cloud Platform, and what to do when readers see stale content. Start with how caching works.

How caching worksWhat sits between a visitor and your Drupal code (Varnish in front, memcached behind), what makes a response cacheable, and how Drupal's cache settings feed the platform layer.

Fix stale contentYour deploy went out but production still shows the old page. Read the response headers to find which cache layer is serving it, then purge the right one.