This plugin does not install nor configure a cache proxy. It acts as an interface with such services.
One common method of caching content for websites is via the use of reverse proxy caching.
Proxy Cache Plugin for WordPress
Common examples of this are Varnish and Nginx. These systems allow a website to update content and have the visitor’s experience cached without the need for complex plugins storing the files locally and using up a user’s disk space.
A reverse proxy cache is installed in front of a server and reviews requests. If the page being requested is already cached, it delivers the cached content. Otherwise it generates the page and the cache on demand.
The Proxy Cache Purge plugin sends a request to delete (aka flush) the cached data of a page or post every time it’s modified.
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