You have to work on your .htacess file.
This is an example of a configuration in one of my sites:
Code <IfModule mod_expires.c>
ExpiresActive On
ExpiresByType text/html "access plus 1 seconds"
ExpiresByType image/x-icon "access plus 2592000 seconds"
ExpiresByType image/gif "access plus 2592000 seconds"
ExpiresByType image/jpeg "access plus 2592000 seconds"
ExpiresByType image/png "access plus 2592000 seconds"
ExpiresByType application/font-woff "access plus 2592000 seconds"
ExpiresByType application/vnd.ms-fontobject "access plus 2592000 seconds"
ExpiresByType application/x-shockwave-flash "access plus 2592000 seconds"
ExpiresByType text/css "access plus 604800 seconds"
ExpiresByType text/javascript "access plus 604800 seconds"
ExpiresByType application/javascript "access plus 604800 seconds"
ExpiresByType application/x-javascript "access plus 604800 seconds"
ExpiresByType text/x-js "access plus 604800 seconds"
</IfModule>
I hope it helps
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