> I presume it's quite easy to block requests to Apache based on the
> referering site?
>mod_rewrite? Use RewriteCond with %{HTTP_REFERER} and a suitable regex, and
send a 403 response using RewriteRule with an F|forbidden flag.
> Has anyone tried it and discovered it's a huge load on the server and
> not worth implementing?
>Not sure really. If you do use mod_rewrite, it'll have to pass through
everything under the directory with the RewriteRule's, but it doesn't seem
to put an enormous load on the machine - I've rewritten everything at
sld.tld to host.sld.tld because of dodgy cookie handling in some browsers,
and it hasn't broken me. Make sure you set the RewritelogLevel fairly low
though.
HTH
adam
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