How to block by user agent?!

[Nuno Magalhães]

I didn't find Zulu here[1] or there[2], so it may be someone faking
their user-agent string. See if the IP is the same, work from there
(although IPs can be dynamic, i know...)

[1] http://www.useragentstring.com/pages/useragentstring.php
[2] http://www.user-agents.org/index.shtml?t_z

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