Thêm các dòng sau vào file .htaccess ở thư mục gốc webserver:
## module gzip
SetOutputFilter DEFLATE
## type file compress
AddOutputFilterByType DEFLATE text/html text/css text/plain text/xml application/x-javascript application/x-httpd-php
#### old browser
BrowserMatch ^Mozilla/4 gzip-only-text/html
BrowserMatch ^Mozilla/4\.0[678] no-gzip
BrowserMatch \bMSIE !no-gzip !gzip-only-text/html
BrowserMatch \bMSI[E] !no-gzip !gzip-only-text/html
#### not compress image
SetEnvIfNoCase Request_URI \.(?:gif|jpe?g|png)$ no-gzip
Header append Vary User-Agent env=!dont-vary
# Expires Headers - 2678400s = 31 days
ExpiresActive On
ExpiresDefault "access plus 1 seconds"
ExpiresByType text/html "access plus 7200 seconds"
ExpiresByType image/gif "access plus 2678400 seconds"
ExpiresByType image/jpeg "access plus 2678400 seconds"
ExpiresByType image/png "access plus 2678400 seconds"
ExpiresByType text/css "access plus 518400 seconds"
ExpiresByType text/javascript "access plus 2678400 seconds"
ExpiresByType application/x-javascript "access plus 2678400 seconds"
# Cache Headers
# Cache specified files for 31 days
Header set Cache-Control "max-age=2678400, public"
# Cache HTML files for a couple hours
Header set Cache-Control "max-age=7200, private, must-revalidate"
# Cache PDFs for a day
Header set Cache-Control "max-age=86400, public"
# Cache Javascripts for 31 days
Header set Cache-Control "max-age=2678400, private"
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