Magento has an aggressive browser caching policy that sets a default expiration of “access plus 1 year”. That tells your browser to cache everything locally for 1 year after the first access. You may notice some weird behavior in your Magento admin with that on, though. Like, after editing a product you have to hit refresh to see the changes when you edit it a second time. To tell web browsers to not cache Magento admin pages, add this to your Apache config: