Installation¶

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

Server Configuration¶

Modify the .htaccess file in the Joomla! site directory, and add the following directives:

<IfModule LiteSpeed>
    CacheLookup on
</IfModule>

If your Joomla! site has a separate mobile view, please also add the following:

<IfModule LiteSpeed>
    RewriteEngine On
    RewriteCond %{HTTP_USER_AGENT} Mobile|Android|Silk/|Kindle|BlackBerry|Opera\ Mini|Opera\ Mobi [NC]
    RewriteRule .* - [E=Cache-Control:vary=ismobile]
    RewriteCond %{REQUEST_URI} enquiry [NC]
    RewriteRule .* - [E=Cache-Control:no-cache]
</IfModule>

Extension Installation¶

1. Download the LSCache for Joomla! package from our site.
2. From the Joomla! Administration menu, navigate to Extensions > Manage > Install.
   
3. Select the Upload Package File tab, and drag the zip file into the window, or press the button to browse for the file.
   
4. The plugin will be automatically installed and enabled.

Verify the Plugin is Enabled¶

Navigate to Extensions > Plugins. If you have a lot of plugins listed, type LiteSpeed into the search box to bring up the LiteSpeed Cache Plugin.

Look for the green check mark next to the plugin name. This indicates that the plugin is installed and enabled. If you see a red X instead, click the red X to enable the plugin. Once you’ve done that, the green check mark should appear, and you are good to go.

If you wish to disable the plugin in the future, you may click the green check mark to toggle it back to the red X.

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.