# Installation¶

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

Tip

You can still use other types of cache (like object cache), but only one page cache can be used at a time, so you’ll need to disable any other page caches, if you want to use LSCache.

Tip

To avoid a potential conflict with LiteSpeed Web Server, you may want to keep Joomla!'s gzip function Off. You'll find this setting in System > Global Configuration > Server > Gzip Page Compression.

## Server Configuration¶

Note

Please see the Overview for the server-level requirements before attempting to install this extension.

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

<IfModule LiteSpeed>
CacheLookup on
</IfModule>


<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¶

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¶

Video

See a video demonstration of this topic here.

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.

The X-LiteSpeed-Cache header is most common, but you may see X-LSADC-Cache if your site is served by LiteSpeed Web ADC. You may also see X-QC-Cache if your site was served via QUIC.cloud CDN. These alternate headers are also an indication that LSCache is working properly on your site.

Important

If you don't see X-LiteSpeed-Cache: hit or X-LiteSpeed-Cache: miss (or any of the alternative headers), then there is a problem with the LSCache configuration.

### 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

Last update: January 20, 2021