Question

I need to make sure when the user hits back with, for example, the mouse, the browser doesn’t instantly load the page from the cache and instead runs the associated code again.

This is what my .htaccess looks like. It appears to be just Firefox that is ignoring the cache settings.

<IfModule mod_expires.c>
    ExpiresActive On
#   ExpiresDefault A2630000
    ExpiresByType image/vnd.microsoft.icon "access plus 1 year"
    ExpiresByType image/ico "access plus 1 year"
    ExpiresByType image/gif A2630000
    ExpiresByType image/jpeg A2630000
    ExpiresByType image/png A2630000
    ExpiresByType application/x-javascript M2630000
    ExpiresByType text/css M2630000
</IfModule>

<IfModule mod_headers.c>
    Header set Cache-Control "public"
</IfModule>

#make php scripts uncacheable
<FilesMatch "php">
    Header unset Cache-Control:
    Header append Cache-Control: "no-cache, must-revalidate"
</FilesMatch>

SetOutputFilter DEFLATE

AddOutputFilterByType DEFLATE text/css
AddOutputFilterByType DEFLATE application/javascript

Answer 1

A shot in the dark, but the header names aren’t supposed to have colons. Try

<FilesMatch "\.php$">
    Header set Cache-Control "no-cache, must-revalidate"
</FilesMatch>

(I also changed the FilesMatch condition to match only php extensions, and removed the unset/append – set should do the same job.