Protect Koha from web crawlers

We live in troubling times, as web crawlers have become so prevalent in internet traffic that they can cause denial-of-service attacks on Koha instances. Simplest possible way to prevent this is following rule: <LocationMatch "^/cgi-bin/koha/(opac-search\.pl|opac-shelves\.pl|opac-export\.pl|opac-reserve\.pl)$"> # Block requests without a referer header RewriteEngine On RewriteCond %{HTTP_REFERER} ^$ RewriteRule .* - [F,L] # Optional: Return a 403 Forbidden status code ErrorDocument 403 "Access Forbidden: Direct access to this resource is not allowed." </LocationMatch> This helps to mitigate problems like this:...