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>