The idea is to reduce network latency by getting the cache closer to the user’s web browser. Akamai is one of the well-known CDN providers. You can put a copy of Varnish in your data center next to your web server and it will reduce the traffic that hits your web server allowing increased traffic.Ĭontent Delivery Networks (CDNs) support another form of caching, “edge caching”. Using a web accelerator such as Varnish is one approach to caching. Every so often you should get a new copy of the page from the real web server and put that into your cache to keep the served content fresh, or discard old content that has not been accessed to reclaim cache space for other pages. This means you can serve more requests per second by using your cache. content from a database), cache is faster than hitting your main web server. For most pages containing dynamic content (e.g. It was not long before people realized that as well as caching in a web browser, caching is also useful at the server side as the same request might come from different users. So one page for a customer may be the result of many HTTP requests, and each returned asset might have different caching requirements. It is also true for all the JavaScript and CSS files on a page. This is also true for images on a page (each image typically triggers a separate HTTP request). This allows a web browser to save a copy of the page so if the user comes back later, the page does not have to be downloaded again. A HTTP GET request to fetch a page has headers that say how long a returned page can be trusted as being up-to-date. This post provides a high level summary of the new caching strategy.įirst, a quick summary of the basics of HTTP caching. Yes, caching was mentioned first! Magento 2 has included a lot of changes from Magento 1 to improve its built in support for caching, making it easier to deploy caching and take some the complexity out of caching for developers. A famous quote however is “ There are only two hard things in Computer Science: cache invalidation and naming things” – Phil Karlton. Web accelerators (caching) can make a Magento installation deliver a more responsive user experience with less hardware.

Magento 2 private cache