Installation¶

Before installing and activating the LSCache plugin, deactivate all other full-page cache plugins.

Module Installation¶

1. Download the LSCPS plugin.
2. Log into your PrestaShop Admin
3. Set Advanced Parameters > Performance> Debug mode > Disable all overrides to NO. This is required to ensure proper functioning of the ESI hole-punching feature.
4. Navigate to Modules > Module Catalog, and click on Install a module.
5. Select the LSCPS zip file.
6. Enable the module by navigating to LiteSpeed Cache > Settings and setting Enable LiteSpeed Cache to Yes.

Fixing an Error¶

If you see the following error message, Directory /home/example/example.com/app/logs is not writable, you can fix it like so:

touch /home/example/example.com/app/logs
chown example:example /home/example/example.com/app/logs

Then, upload and install the module again.

.htaccess Update¶

When you enable or disable LiteSpeed Cache from the plugin, the .htaccess file should be automatically updated. If the update fails, it is usually due to file permissions. You can update it manually if necessary.

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

# LITESPEED_CACHE_START Do not remove this comment line, LiteSpeedCache plugin will automatically update this block
<IfModule LiteSpeed>
CacheLookup on
</IfModule>
# LITESPEED_CACHE_END

Verify Your Site is Being Cached¶

You can verify a page is being served from LSCache through the following steps:

1. From a non-logged-in browser, navigate to your site, and open the developer tools (usually, right-click > Inspect). Open the Network tab.
2. Refresh the page.
3. Click the first resource. This should be an HTML file. For example, if your page is http://example.com/webapp/, your first resource should either be something like example.com/webapp/ or webapp/.
4. You should see headings similar to these:

   X-LiteSpeed-Cache: miss
   X-LiteSpeed-Cache-Control:public,max-age=1800
   X-LiteSpeed-Tag:B1_F,B1_ 
   

   These headings mean the page had not yet been cached, but that LiteSpeed has now stored it, and it will be served from cache with the next request.
5. Reload the page and you should see X-LiteSpeed-Cache: hit in the response header. This means the page is being served by LSCache and is configured correctly.
   

Non-Cacheable Pages¶

Sometimes there are pages which should not be cached. To verify that such pages have indeed been excluded from caching, check the developer tools as described above.

You should see headings similar to these:

X-LiteSpeed-Cache-Control:no-cache, esi=on
X-LiteSpeed-Tag:B1_F,B1_ 

X-LiteSpeed-Cache-Control, when set to no-cache, indicates that LiteSpeed Server has served your page dynamically, and that it was intentionally not served from cache.

LSCache Check Tool¶

There's a simple way to see if a URL is cached by LiteSpeed: the LSCache Check Tool.

Enter the URL you wish to check, and the tool will respond with an easy-to-read Yes or No result, and a display of the URL's response headers, in case you want to examine the results more closely.

In addition to LSCache support, the tool can detect cache hits, and can detect when sites are using LiteSpeed Web ADC or QUIC.cloud CDN for caching.

Additionally, a Stale Cache Warning will alert you if browser cache is detected on dynamic pages. This is because browser cache may interfere with the delivery of fresh content.