<FilesMatch "\.(php|html|htm|txt|html5|jpg|png|js|css)$">
Header set Cache-Control "max-age=604800"
Header set last-modified "Tus May 15 13:00:00 EDT 2012"
</FilesMatch>

#Deshabilitar parametros siguientes

<FilesMatch "\.(pl|cgi|spl|html)$">
    Header unset Cache-Control
    Header unset Expires
    Header unset Last-Modified
    FileETag None
    Header unset ETag
    Header unset Pragma
</FilesMatch>

https://community.cloudflare.com/t/cf-cache-status-miss-cache-control-no-cache/84863/7