How do I get a PDF file I link to not to cache?

[jamie99]

How do I get a newsletter pdf that I have a link to not to cache? Some users do not know about refreshing pages and keep seeing the old version. Can I force the PDF either to reload fresh or not to cache at all?

[descalzo]

Add the following to your .htaccess file

<FilesMatch "\.pdf$">
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>

This should turn off all caching.