How to Enable expire headers in Apache?

Please find the below steps to enable expire headers in apache

Step-1:- Use the below command to enable “expires” module

sudo a2enmod expires

Step-2:- Add below lines in /etc/apache2/sites-enabled/example.conf

<IfModule mod_expires.c>

 
ExpiresActive On
 ExpiresByType text/css A31536000
 ExpiresByType text/x-component A31536000
 ExpiresByType application/x-javascript A31536000
 ExpiresByType application/javascript A31536000
 ExpiresByType text/javascript A31536000
 ExpiresByType text/x-js A31536000
 ExpiresByType text/html A3600
 ExpiresByType text/richtext A3600
 ExpiresByType text/plain A3600
 ExpiresByType text/xsd A3600
 ExpiresByType text/xsl A3600
 ExpiresByType text/xml A3600
 ExpiresByType video/asf A31536000
 ExpiresByType video/avi A31536000
 ExpiresByType image/bmp A31536000
 ExpiresByType application/java A31536000
 ExpiresByType video/divx A31536000
 ExpiresByType application/msword A31536000
 ExpiresByType image/gif A31536000
 ExpiresByType image/x-icon A31536000
 ExpiresByType image/jpeg A31536000
 ExpiresByType image/webp A31536000
 ExpiresByType application/json A31536000
 ExpiresByType audio/midi A31536000
 ExpiresByType video/quicktime A31536000
 ExpiresByType audio/mpeg A31536000
 ExpiresByType video/mp4 A31536000
 ExpiresByType video/mpeg A31536000
 ExpiresByType video/webm A31536000
 ExpiresByType application/x-font-otf A31536000
 ExpiresByType audio/ogg A31536000
 ExpiresByType application/pdf A31536000
 ExpiresByType image/png A31536000
 ExpiresByType audio/x-realaudio A31536000
 ExpiresByType image/svg+xml A31536000
 ExpiresByType application/x-shockwave-flash A31536000
 ExpiresByType application/x-tar A31536000
 ExpiresByType image/tiff A31536000
 ExpiresByType application/x-font-ttf A31536000
 ExpiresByType audio/wav A31536000
 ExpiresByType audio/wma A31536000
 ExpiresByType application/font-woff A31536000
 ExpiresByType application/font-woff2 A31536000
 ExpiresByType application/zip A31536000
 </IfModule>

Step-3:- After adding adding restart apache2 with the below command

 systemctl restart apache2

For reference follow below link
https://tecadmin.net/leverage-browser-caching-with-apache/