Block Bots by User Agent String

From Brian Nelson Ramblings
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How to block a bot by User Agent Sting

Do you have those bandwidth hogging bots as much as Phil and I do? Did you know you can block them in your .htaccess file?

Block the BOT

Let block the most annoying bot on the internet - Baidu spider

vim .htaccess

Now Add the following to block bad bots

Via mod_rewrite

RewriteEngine On
RewriteCond %{HTTP_USER_AGENT} Baiduspider [NC,OR] 
RewriteCond %{HTTP_USER_AGENT} Baidu [NC] 
RewriteRule ^.*$ - [F,L]

Via BrowserMatch

BrowserMatchNoCase "Baiduspider" bots 
BrowserMatchNoCase "HTTrack" bots
BrowserMatchNoCase "Yandex" bots
BrowserMatchNoCase "AhrefsBot" bots
BrowserMatchNoCase "Pinterestbot" bots
BrowserMatchNoCase "YandexImages" bots
BrowserMatchNoCase "YandexBot" bots
BrowserMatchNoCase "Facebot" bots
BrowserMatchNoCase "DotBot" bots

Order Allow,Deny
Allow from ALL
Deny from env=bots

That's it save the file, and you are now blocking the Baidu spider

Testing to see if its blocked

One way to do this is to use curl

curl -I http://www.briansnelson.com -A "Mozilla/5.0 (compatible; Baiduspider/2.0; +http://www.baidu.com/search/spider.html)"

Now you will get a 403 Forbidden

HTTP/1.1 403 Forbidden
Date: Mon, 06 Jan 2014 19:18:11 GMT