.htaccess

IndexIgnore *
ErrorDocument 404 /assets/php/404.php
ErrorDocument 403 /assets/php/403.php

RewriteEngine on
RewriteBase /

#These are the original rewrites, but might cause problems with some server configs.
#RewriteCond $1 !^(index\.php|assets|user_guide|robots\.txt)
#RewriteRule ^(.*)$ /index.php/$1 [L]

#These conditions are tested to work, and should be a better alternative to the commented ones above.
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*)$ index.php?/$1 [L]
  

<FilesMatch "\.(ico|jpg|jpeg|png|gif)$">
Header set Cache-Control "max-age=290304000, public"
</FilesMatch>