$sudo a2enmod expires
$sudo a2enmod headers
$sudo /etc/init.d/apache2 restart
$sudo nano /etc/apache2/sites-available/default
<IfModule mod_deflate.c>
# Insert filter
SetOutputFilter DEFLATE
BrowserMatch ^Mozilla/4\.0[678] no-gzip
BrowserMatch \bMSI[E] !no-gzip !gzip-only-text/html
# file-types indicated will not be compressed
SetEnvIfNoCase Request_URI \.(?:gif|jpe?g|png|bmp|rar|zip|7z|bz?|pdf)$ no-gzip dont-vary
# Make sure proxies don't deliver the wrong content
Header append Vary User-Agent env=!dont-vary
<IfModule mod_headers.c>
Header append Vary User-Agent
</IfModule>
</IfModule>
<IfModule mod_expires.c>
# enable expirations
ExpiresActive On
ExpiresByType image/gif "access plus 1 week"
ExpiresByType image/png "access plus 1 week"
ExpiresByType image/jpg "access plus 1 week"
ExpiresByType image/jpeg "access plus 1 week"
ExpiresByType image/bmp "access plus 1 week"
ExpiresByType image/x-icon "access plus 1 week"
ExpiresByType text/css "access plus 1 days"
ExpiresByType application/pdf "access plus 1 days"
ExpiresByType audio/x-wav "access plus 1 week"
ExpiresByType audio/mpeg "access plus 1 week"
ExpiresByType video/mpeg "access plus 1 week"
ExpiresByType video/mp4 "access plus 1 week"
ExpiresByType video/quicktime "access plus 1 week"
ExpiresByType video/x-ms-wmv "access plus 1 week"
ExpiresByType text/javascript "access plus 1 days"
ExpiresByType application/x-javascript "access plus 1 days"
ExpiresByType application/javascript "access plus 1 days"
ExpiresByType text/html "access plus 30 seconds"
</IfModule>
$sudo nano /etc/apache2/sites-available/default
3. Запускаем Firefox, кликаем в правом нижнем углу по "жуку" и выбираем пункт "Page speed" и нажимаем кнопку