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Valuebound: A beginners guide to caching in Drupal 8

Error message

User error: Failed to connect to memcache server: localhost:11212 in dmemcache_object() (line 415 of /home/freedrup/public_html/demo/d7/sites/all/modules/memcache/dmemcache.inc).

Caching is a popular technique to optimize the performance of a website. It is a process that stores web data (HTML, CSS, Image) in some accessible space. Moreover, a cache is a detailed information of a validity of a resource. This information defines for how long the resource is valid and should not be considered stale. The information can be stored at every level right from the original server to intermediate proxies to the browser.

Here you will get to learn about what key/value pairs in the header mean and Cacheability metadata in Drupal 8.

Every request or response contains a HTTP header, which provides additional information about the request/response. This…

Source: 
http://valuebound.com/resources/blog/a-beginners-guide-to-caching-drupal-8