Turn OFF Cache for specific file with Apache

Question

I have a page on a site which uses random() twig, in Firefox and Chrome it is prevented from working because it gets cached as soon as the page loads.

Answer 1

Figured it out, to target a specific file (in this case index.php), add this code to the bottom of .htaccess

<Files index.php>
FileETag None
Header unset ETag
Header set Cache-Control "max-age=0, no-cache, no-store, must-revalidate"
Header set Pragma "no-cache"
Header set Expires "Wed, 11 Jan 1984 05:00:00 GMT"
</Files>

Alternatively to target a specific selection of files, ie. I'd like to cache images but nothing else (files that match html, htm, js, css, php will not be cached):

<filesMatch "\.(html|htm|js|css|php)$">
FileETag None
Header unset ETag
Header set Cache-Control "max-age=0, no-cache, no-store, must-revalidate"
Header set Pragma "no-cache"
Header set Expires "Wed, 11 Jan 1984 05:00:00 GMT"
</filesMatch>

To check the .htaccess was being read I entered a few lines of rubbish at the bottom, found out it wasn't being read, renamed it from htaccess to .htaccess and it worked.