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Cache API | Drupal APIs | Drupal Wiki guide on Drupal.org

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Varnish is used on thousands of Drupal sites to</p></section><section><h2><a href="/docs/8/api/cache-api/cacheabledependencyinterface-friends">CacheableDependencyInterface &amp; friends</a></h2><p>To make dealing with cacheability metadata (cache tags, cache contexts and max-age) easier, Drupal 8 has CacheableDependencyInterface.</p></section><section><h2><a href="/docs/8/api/cache-api/cacheableresponseinterface">CacheableResponseInterface</a></h2><p>This interface lives at the intersection of the Cache API and Responses. 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