What is LiteSpeed Cache ?
LiteSpeed Cache (LSCache) is a built-in, high-performance dynamic content acceleration feature of the LiteSpeed Web Server.
LSCache’s features are very similar to those in Apache mod_cache, but implemented in a more efficient way. LiteSpeed cache works like Varnish. It is an output cache for dynamic contents, so the usage is not limited to PHP pages. Unlike Varnish, LiteSpeed cache is built into LiteSpeed’s web server, thus eliminating one layer of reverse proxy. This translates into higher efficieny for static contents. The uniqueness of LiteSpeed cache is that it uses rewrite rules (either in configuration files or .htaccess) to control its behavior for maximum flexibility.
If there is a LiteSpeed cache plugin available for your web applications (WordPress, WooCommerce, Magento, Xenforo, Mediawiki, Joomla, Drupal), you should follow the corresponding section to set up your cache. In these cases, following this wiki is not recommended as it was written for more general non-application-specific caching. As a result, it is only applicable when a LiteSpeed cache plugin for your application is not available or you have very customized code base application.
A general way to enable LiteSpeed Cache through rewrite rules is to designate a signature token (such as a cookie) in any page, in most cases it will tell OLS that cache can be enabled and that the TTL(Time To Live) of the cache freshness will remain acceptable. Generating cookies usually requires application code modification. Please refer to this thread on our forum for examples. It is worth noting that the cache function SHOULD ONLY be used for pages that are supposed to be cached or cache friendly. Abuse use of this feature would result in performance degradation and/or other unexpected behaviors.
For more detailed information, Please refer to this article