This should give you the idea:

http://rosslawley.co.uk/2010/01/nginx-how-to-multiple-if-statements.html

----- Original Message -----
From: "Peter Hinse" <loco@d0pefish.de>
To: <nginx@nginx.org>
Sent: Thursday, April 05, 2012 4:30 PM
Subject: Combine if clauses for denial


> Hi all,
>
> I know how to block requests with an empty user-agent or with an empty
> referrer - is it possible to combine these two criteria and deny access
> when a request has no referrer AND no user-agent?
>
> Regards,
>
> Peter
>
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> nginx@nginx.org
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