July 6, 2021 . 2 MIN READ
Did you enable mod_expires and mod_headers? And remember to restart Apache after changing its configuration. Run:
sudo a2enmod headers
sudo a2enmod expires
service apache2 restart
http://www.liquidweb.com/kb/how-to-configure-apache-2-to-control-browser-caching/
Apache must be configured with the appropriate modules to leverage browser caching.
Let’s check for mod_expires (expires_module) first:
apachectl -M | grep expires
… should return:
expires_module (shared)
Then let’s check for mod_headers (headers_module):
apachectl -M | grep headers
… should return:
headers_module (shared)
This code can be placed in the .htaccess files for specific directories, or in your root web directory, but we suggest placing it in your httpd.conf.
<IfModule mod_expires.c>
# Turn on the module.
ExpiresActive on
# Set the default expiry times.
ExpiresDefault “access plus 2 days”
ExpiresByType image/jpg “access plus 1 month”
ExpiresByType image/gif “access plus 1 month”
ExpiresByType image/jpeg “access plus 1 month”
ExpiresByType image/png “access plus 1 month”
ExpiresByType text/css “access plus 1 month”
ExpiresByType text/javascript “access plus 1 month”
ExpiresByType application/javascript “access plus 1 month”
ExpiresByType application/x-shockwave-flash “access plus 1 month”
ExpiresByType text/css “now plus 1 month”
ExpiresByType image/ico “access plus 1 month”
ExpiresByType image/x-icon “access plus 1 month”
ExpiresByType text/html “access plus 600 seconds”
</IfModule>
The above directives can be implemented easily. If you’re not already, SSH into your server as root. Then we’ll use vim to edit the httpd.conf file. For a refresher on editing files with vim see: New User Tutorial: Overview of the Vim Text Editor. If you’re using Liquid Web’s CentOS 7 Core Managed image then the following command already uses the correct location:
vim /etc/httpd/conf/httpd.conf
Find a section that looks like this:
# Further relax access to the default document root:
<Directory “/var/www/html”>
… the section above (in this case) is the default document root. Add the expiration directives between<Directory “/var/www/html”> and </Directory>.
Then restart Apache 2!
systemctl restart httpd
Full details for mod_expires can be found in the Apache Documentation.
