Cache Enabler for Wordpress. .htaccess config modified from https://www.keycdn.com/support/wordpress-cache-enabler-plugin#apache

Cache Enabler .htaccess

# BEGIN Cache Enabler
<IfModule mod_rewrite.c>
    RewriteEngine On

    # cache directory
    RewriteRule ^ - [E=CE_CACHE_DIR:/wp-content/cache/cache-enabler]

    # default cache keys
    RewriteRule ^ - [E=CE_CACHE_KEY_SCHEME:http-]

    # scheme cache key
    RewriteCond %{HTTPS} ^(on|1)$ [OR]
    RewriteCond %{SERVER_PORT} =443 [OR]
    RewriteCond %{HTTP:X-Forwarded-Proto} =https [OR]
    RewriteCond %{HTTP:X-Forwarded-Scheme} =https
    RewriteRule ^ - [E=CE_CACHE_KEY_SCHEME:https-]

    # device cache key
    # RewriteCond %{HTTP_USER_AGENT} (Mobile|Android|Silk/|Kindle|BlackBerry|Opera Mini|Opera Mobi)
    # RewriteRule ^ - [E=CE_CACHE_KEY_DEVICE:-mobile]

    # webp cache key
    RewriteCond %{HTTP:Accept} \bimage/webp\b
    RewriteRule ^ - [E=CE_CACHE_KEY_WEBP:-webp]

    # compression cache key
    <IfModule mod_mime.c>
        RewriteCond %{HTTP:Accept-Encoding} gzip
        RewriteRule ^ - [E=CE_CACHE_KEY_COMPRESSION:.gz]
        AddType text/html .gz
        AddEncoding gzip .gz
    </IfModule>

    # get cache file
    RewriteRule ^ - [E=CE_CACHE_FILE_DIR:%{ENV:CE_CACHE_DIR}/%{HTTP_HOST}]
    RewriteRule ^ - [E=CE_CACHE_FILE_NAME:%{ENV:CE_CACHE_KEY_SCHEME}index%{ENV:CE_CACHE_KEY_DEVICE}%{ENV:CE_CACHE_KEY_WEBP}.html%{ENV:CE_CACHE_KEY_COMPRESSION}]
    RewriteRule ^ - [E=CE_CACHE_FILE:%{ENV:CE_CACHE_FILE_DIR}/%{ENV:CE_CACHE_FILE_NAME}]

    # check request method
    RewriteCond %{REQUEST_METHOD} ^GET|HEAD$

    # URL ends with / or .php
    RewriteCond %{REQUEST_URI} (/|.php)$

    # check excluded query strings
    RewriteCond %{QUERY_STRING} !nocache [NC]
    RewriteCond %{QUERY_STRING} !^(.*?((fbclid|ref|mc_(cid|eid))|(utm_(source|medium|campaign|term|content|expid))|(gclid|fb_(action_ids|action_types|source))|(age-verified|usqp|cn-reloaded|_ga|_ke))).+?$

    # check excluded cookies
    RewriteCond %{HTTP_COOKIE} !(wp-postpass|wordpress_logged_in|comment_author)_
    RewriteCond %{THE_REQUEST} !^\s(/_test/|/wp-json/.*|/wp-admin/.*|/xmlrpc.php.*|/wp-login.php.*)$ [NC]

    # check if cache file exists
    RewriteCond %{DOCUMENT_ROOT}%{ENV:CE_CACHE_DIR}/%{HTTP_HOST}/$1/%{ENV:CE_CACHE_FILE_NAME} -f

    # check permalink structure has trailing slash
    # RewriteCond %{REQUEST_URI} /[^\./\?]+(\?.*)?$
    # check permalink structure has no trailing slash
    # RewriteCond %{REQUEST_URI} /[^\./\?]+/(\?.*)?$

    # deliver cache file
    RewriteRule ^(.*)$ %{ENV:CE_CACHE_DIR}/%{HTTP_HOST}/$1/%{ENV:CE_CACHE_FILE_NAME} [L,END]
</IfModule>
# END Cache Enabler