htaccess dosyasına:

Apache için;

<IfModule mod_expires.c>
ExpiresActive On

# Images
ExpiresByType image/jpeg "access plus 1 year"
ExpiresByType image/gif "access plus 1 year"
ExpiresByType image/png "access plus 1 year"
ExpiresByType image/webp "access plus 1 year"
ExpiresByType image/svg+xml "access plus 1 year"
ExpiresByType image/x-icon "access plus 1 year"

# Video
ExpiresByType video/webm "access plus 1 year"
ExpiresByType video/mp4 "access plus 1 year"
ExpiresByType video/mpeg "access plus 1 year"

# Fonts
ExpiresByType font/ttf "access plus 1 year"
ExpiresByType font/otf "access plus 1 year"
ExpiresByType font/woff "access plus 1 year"
ExpiresByType font/woff2 "access plus 1 year"
ExpiresByType application/font-woff "access plus 1 year"

# CSS, JavaScript
ExpiresByType text/css "access plus 1 year"
ExpiresByType text/javascript "access plus 1 year"
ExpiresByType application/javascript "access plus 1 year"

# Others
ExpiresByType application/pdf "access plus 1 year"
ExpiresByType image/vnd.microsoft.icon "access plus 1 year"
</IfModule>

Litespeed kullanıyorsanız;

Litespeed Cache eklentisinde Browser sekmesine gidin ve Browser Cache: ON konumuna getirin.

Nginx;

Plesk panel üzerinde https://support.plesk.com/hc/en-us/articles/115001374153-How-to-enable-leverage-browser-caching-for-nginx- bu kaynakta yer alanları uygulayabilirsiniz.

Kolay gelsin.