In .htaccess i have added a "Header set Cache-control" rule and is working fine (most of it) but in iOS this is not working due to the caching in iOS i think. Is there a solution to force refresh the new pdf files?
<IfModule mod_headers.c>
<FilesMatch ".(pdf)$">
Header set Cache-Control "max-age=0, public, must-revalidate"
</FilesMatch>
</IfModule>