Avoid logging specific user agents requests

[B.R.]

Hello,

Following: http://trac.nginx.org/nginx/ticket/713

How does one avoid logging (ie set 'access_log off') requests from specific
user agents?

Using 'if' would mean to use 'return' inside (as it is advised to do with
that directive, not continuing the normal process).
Using 'map', as shown in ticket #713, does not work as expected.

Thanks,
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*B. R.*
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