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- Search Engines
-- Search Engine Spider and User Agent Identification
---- a legitimate blank?

g1smd - 7:56 am on Jun 8, 2011 (gmt 0)


RewriteEngine On
RewriteCond %{HTTP_USER_AGENT} ^-?$ [OR]
RewriteRule .* - [F]

The [OR] looks like an error.

I block on blank user agent AND blank referrer:

RewriteCond %{HTTP_REFERER} ^-?$
RewriteCond %{HTTP_USER_AGENT} ^-?$
RewriteCond %{REQUEST_METHOD} !^HEAD$
RewriteCond %{REQUEST_URI} !^/robots\.txt
RewriteRule .* - [F]

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