htaccess disable cache for specific URLs - apache

Question

I use .htaccess to cache my images, JS and CSS files onmy website's front end.
The website is built under Codeigniter 2.
Here is my code :
RewriteEngine on
#RewriteRule ^index\.php / [R=301]
RewriteCond %{THE_REQUEST} index\.php
RewriteRule ^index.php(?:/(.*))?$ https://www.mywebsite.com/$1 [R=301,L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond $1 !^(index\.php|resources|robots\.txt)
RewriteRule ^(.*)$ index.php/$1 [L,QSA]
#Compression Gzip
<IfModule mod_deflate.c>
AddOutputFilterByType DEFLATE application/x-javascript application/javascript
text/javascript text/css text/html text/xml
</IfModule>
# Cache One month for most static assets
<filesMatch ".(jpg|jpeg|png|gif|ico)$">
Header set Cache-Control "max-age=2628000, public"
</filesMatch>
#Force la redirection vers www.
#RewriteCond %{HTTP_HOST} !^www\.mywebsite\.com$ [NC]
#RewriteCond %{REQUEST_URI} !^/[0-9]+\..+\.cpaneldcv$
#RewriteCond %{REQUEST_URI} !^/\.well-known/pki-validation/[A-F0-9]{32}\.txt(?:\ Comodo\ DCV)?$
#RewriteRule .? https://www.mywebsite.com%{REQUEST_URI} [R=301,L]
RewriteCond %{SERVER_PORT} 80
RewriteRule ^(.*)$ https://www.mywebsite.com/$1 [R,L]
<IfModule mod_deflate.c>
AddOutputFilterByType DEFLATE application/javascript
AddOutputFilterByType DEFLATE application/rss+xml
AddOutputFilterByType DEFLATE application/vnd.ms-fontobject
AddOutputFilterByType DEFLATE application/x-font
AddOutputFilterByType DEFLATE application/x-font-opentype
AddOutputFilterByType DEFLATE application/x-font-otf
AddOutputFilterByType DEFLATE application/x-font-truetype
AddOutputFilterByType DEFLATE application/x-font-ttf
AddOutputFilterByType DEFLATE application/x-javascript
AddOutputFilterByType DEFLATE application/xhtml+xml
AddOutputFilterByType DEFLATE application/xml
AddOutputFilterByType DEFLATE font/opentype
AddOutputFilterByType DEFLATE font/otf
AddOutputFilterByType DEFLATE font/ttf
AddOutputFilterByType DEFLATE image/svg+xml
AddOutputFilterByType DEFLATE image/x-icon
AddOutputFilterByType DEFLATE text/css
AddOutputFilterByType DEFLATE text/html
AddOutputFilterByType DEFLATE text/javascript
AddOutputFilterByType DEFLATE text/plain
</IfModule>
<IfModule mod_gzip.c>
mod_gzip_on Yes
mod_gzip_dechunk Yes
mod_gzip_item_include file .(html?|txt|css|js|php|pl)$
mod_gzip_item_include handler ^cgi-script$
mod_gzip_item_include mime ^text/.*
mod_gzip_item_include mime ^application/x-javascript.*
mod_gzip_item_exclude mime ^image/.*
mod_gzip_item_exclude rspheader ^Content-Encoding:.*gzip.*
</IfModule>
<IfModule mod_expires.c>
ExpiresActive On
ExpiresByType image/jpg "access 1 year"
ExpiresByType image/jpeg "access 1 year"
ExpiresByType image/gif "access 1 year"
ExpiresByType image/png "access 1 year"
ExpiresByType text/css "access 1 month"
ExpiresByType text/html "access 1 month"
ExpiresByType application/pdf "access 1 month"
ExpiresByType text/x-javascript "access 1 month"
ExpiresByType application/x-shockwave-flash "access 1 month"
ExpiresByType image/x-icon "access 1 year"
ExpiresDefault "access 1 month"
</IfModule>
<IfModule mod_headers.c>
<filesmatch "\.(ico|flv|jpg|jpeg|png|gif|css|swf)$">
Header set Cache-Control "max-age=2678400, public"
</filesmatch>
<filesmatch "\.(html|htm)$">
Header set Cache-Control "max-age=7200, private, must-revalidate"
</filesmatch>
<filesmatch "\.(pdf)$">
Header set Cache-Control "max-age=86400, public"
</filesmatch>
<filesmatch "\.(js)$">
Header set Cache-Control "max-age=2678400, private"
</filesmatch>
</IfModule>
It works fine. However, when I am working in the backend (www.mywebsite/admin), the cache also applies, which is pretty anoying when updating images and texts.
I have tried this solution at the very bottom of my htaccess file :
htaccess Disable cache if URL contains string?
but my content is still read from the memory cache.
I also tried the "Location" and "LocationMatch" directive, but it creates an Internal Server Error :
<Location /admin>
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"
</Location >
Is there someone who could help on this please ?
Thanks !

Answer 1

<Directory /some/real/path/to/tmp>
Header Set Pragma "no-cache"
Header Set Expires "Thu, 1 Jan 1970 00:00:00 GMT"
Header Set Cache-Control "max-age=0, no-store, no-cache, must-revalidate"
Header Unset ETag
FileETag None
</Directory>
That should works.