How to solve simple wp simple ajax chat caching problem

This might be a solution but I have not tested it.

go to: wp-admin/admin.php?page=litespeed-cache#excludes

Or navigate litespeed->cache->excludes

<IfModule LiteSpeed>
 RewriteEngine On
 RewriteCond %{REQUEST_URI} ^/filename\.php
 RewriteRule .* - [E=cache-control:no-cache]
</IfModule>

replace filename with the plugin filename.

error code: 521