LSCache + PrestaShop Configuration

LSCache, similar to Varnish cache, is a simpler and more efficient page caching solution built-in to LiteSpeed Web Server. When used in conjunction with PrestaShop, you can expect significant performance gains with a quick and easy setup. Cache management is also made significantly easier and more flexible. While the LiteSpeed cache plugin for Prestashop is still in development, rewrite rules can still be used to customize LSCache's behavior.

Below are some recommended configurations to enable LSCache and get it working with your PrestaShop site(s).

Server/VirtualHost level cache storage needs to be configured properly for your environment. Select your server setup from the Web Server Configuration section of our LiteSpeed Cache Installation Guide and follow the instructions to set the server/virtual host level cache root and cache policy.

At the top of your .htaccess file, located in the document root of your PrestaShop installation, add the following:

########## Begin - Litespeed cache
<IfModule LiteSpeed>
  CacheLookup public on
  RewriteEngine On
  RewriteCond %{REQUEST_METHOD} ^GET|HEAD|PURGE$
  RewriteCond %{HTTP_HOST} ^(www.)?your_domain_name.com [NC]
  RewriteCond %{REQUEST_URI} !you_admin_folder|404|address|authentication|best-sales|cart|contact|discount|guest-tracking|history|identity|order|password|products-comparison|search|account|friend|login|logout|addresses|contact-us|order-history|my-account|order-confirmation|order-follow|quick-order|credit-slip|password-recovery [NC]
  RewriteCond %{HTTP_COOKIE} !logged|cart [NC]
  RewriteCond %{QUERY_STRING} !nocache [NC]
  RewriteRule .* - [E=Cache-Control:max-age=900]
</IfModule>
########## End - Litespeed cache

Where “your_domain_name.com” is the web address of your PrestaShop site and “admin_folder” is the PrestaShop administration folder name specified during installation.

Note: For any friendly URLs included in the REQUEST_URI configuration line, make sure any corresponding translated (rewritten) URLs are also included. (To view friendly URLs in the PrestaShop administration interface, click Preferences » SEO & URLs.)

We recommend using a different domain for your backend such as backend.your_domain_name.com so that you can add/edit/preview a website's content through the admin domain without worrying about these changes being cached and seen by visitors.

To get the non-cached version of a page, add the “nocache” query string to a URL.

For example

https://www.your_domain_name.com/about?nocache
https://www.your_domain_name.com/about?some_other_query_string&nocache

Adding a cron job to delete outdated cache files

While optional, it is a good idea to clear out old cache files that are past the set Time To Live (TTL). To do this enter the following in /etc/crontab

/10 * * * * root find /tmp/diskcache -type f -mmin +8 -delete 2>/dev/null

Note: This cron job deletes cached files that are more than 8 minutes old every 10 minutes. Since the cache TTL is set at 120 seconds (2 minutes), it is safe to delete these files that are way passed TTL.