The Magento page cache library contains a simple PHP reverse proxy that enables page content caching. There are two types of distinguished content: private and public.

The “private” content is being served for each user separately and represents the personalized data of a customer. E.g. shopping cart, wishlist, customer addresses, notification messages. This data should not be cached on the server side, and should not be shown to more than one user. The private content is stored on the client’s side by Customer Data JS component (Magento_Customer/js/customer-data.js). However, this is a topic for another blog post. Today we will focus on the second content type – public content, or rather the cacheable content and its variations in terms of customer grouping.

Can you be really sure that all visitors of your site see it the same way as you do – design and content? In the era, when content matters more and more, one type of hacker attacks became particularly popular – content spoofing. You will find out the algorithms and tools that hackers use to perform such attacks, specifically replacing website’s content for particular visitors.