title: How to add static content expiration using htaccess file
body: <p>htaccess file content. I want to set expiration of my static contents like images, js, css</p>
  
  <pre><code>RewriteEngine On
  RewriteCond $1 !^(index\.php|images|css|js|robots\.txt|favicon\.ico)
  RewriteCond %{REQUEST_URI} ^/system.*
  RewriteRule ^(.*)$ index.php?/$1 [L]
  RewriteCond %{REQUEST_FILENAME} !-f
  RewriteCond %{REQUEST_FILENAME} !-d
  RewriteRule ^(.+)$ index.php?/$1 [L]
  </code></pre>
  
  <p>My images location is </p>
  
  <pre><code>www.sitename.com/css/css/css files
  www.sitename.com/images/img/images
  </code></pre>
  
  <p>like this</p>