Browser cache is very important to speed up your site loading and here is how to speed up by mod_expires and mod_headers.
Before doing anything let 's make sure 2 of these mod are turned on. Here is how to turn on it on Ubuntu.
1. Enable mod_expires and mod_headers
Code:
sudo a2enmod headers
sudo a2enmod expires
Then restart apache to apply the change
Code:
sudo service apache2 restart
or
Code:
sudo /etc/init.d/apache2 restart
2. Add caching code for .htaccess file
Caching with both mod_expires + mod_headers
Code:
# Turn on Expires and set default to 0
ExpiresActive On
ExpiresDefault A0
# Set up caching on media files for 1 year (forever?)
<FilesMatch "\.(flv|ico|pdf|avi|mov|ppt|doc|mp3|wmv|wav)$">
ExpiresDefault A29030400
Header append Cache-Control "public"
</FilesMatch>
# Set up caching on media files for 1 week
<FilesMatch "\.(gif|jpg|jpeg|png|swf)$">
ExpiresDefault A604800
Header append Cache-Control "public"
</FilesMatch>
# Set up 2 Hour caching on commonly updated files
<FilesMatch "\.(xml|txt|html|js|css)$">
ExpiresDefault A7200
Header append Cache-Control "proxy-revalidate"
</FilesMatch>
# Force no caching for dynamic files
<FilesMatch "\.(php|cgi|pl|htm)$">
ExpiresActive Off
Header set Cache-Control "private, no-cache, no-store, proxy-revalidate, no-transform"
Header set Pragma "no-cache"
</FilesMatch>
Caching with mod_headers
Code:
# 1 YEAR
<FilesMatch "\.(flv|ico|pdf|avi|mov|ppt|doc|mp3|wmv|wav)$">
Header set Cache-Control "max-age=29030400, public"
</FilesMatch>
# 1 WEEK
<FilesMatch "\.(jpg|jpeg|png|gif|swf)$">
Header set Cache-Control "max-age=604800, public"
</FilesMatch>
# 3 HOUR
<FilesMatch "\.(txt|xml|js|css)$">
Header set Cache-Control "max-age=10800"
</FilesMatch>
# NEVER CACHE
<FilesMatch "\.(html|htm|php|cgi|pl)$">
Header set Cache-Control "max-age=0, private, no-store, no-cache, must-revalidate"
</FilesMatch>
Caching with mod_expires
Code:
ExpiresActive On
ExpiresDefault A0
# 1 YEAR
<FilesMatch "\.(flv|ico|pdf|avi|mov|ppt|doc|mp3|wmv|wav)$">
ExpiresDefault A29030400
</FilesMatch>
# 1 WEEK
<FilesMatch "\.(jpg|jpeg|png|gif|swf)$">
ExpiresDefault A604800
</FilesMatch>
# 3 HOUR
<FilesMatch "\.(txt|xml|js|css)$">
ExpiresDefault A10800"
</FilesMatch>
And the last one is bonus. Here is list of time maybe you need to change expired time for your code
Code:
# 300 5 MIN
# 600 10 MIN
# 900 15 MIN
# 1800 30 MIN
# 2700 45 MIN
# 3600 1 HR
# 7200 2 HR
# 10800 3 HR
# 14400 4 HR
# 18000 5 HR
# 36000 10 HR
# 39600 11 HR
# 43200 12 HR
# 46800 13 HR
# 50400 14 HR
# 54000 15 HR
# 86400 1 DAY
# 172800 2 DAY
# 259200 3 DAY
# 345600 4 DAY
# 432000 5 DAY
# 518400 6 DAY
# 604800 1 WEEK
# 1209600 2 WEEK
# 1814400 3 WEEK
# 2419200 4 WEEK
# 4838400 2 MONTH
# 7257600 3 MONTH
# 9676800 4 MONTH
# 12096000 5 MONTH
# 14515200 6 MONTH
# 16934400 7 MONTH
# 19353600 8 MONTH
# 21772800 9 MONTH
# 24192000 10 MONTH
# 26611200 11 MONTH
# 29030400 12 MONTH
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