Apache Block by user-agent
SetEnvIfNoCase User-Agent "GPTBot" bot_block
SetEnvIfNoCase User-Agent "Applebot" bot_block
SetEnvIfNoCase User-Agent "Barkrowler" bot_block
SetEnvIfNoCase User-Agent "BacklinksExtendedBot" bot_block
<Limit GET POST>
Order Allow,Deny
Allow from all
Deny from env=bot_block
</Limit>