I tend to use official documentation only, and I run servers, not Windows.

However, thanks for the pointer: the answer might be that 'if' parameter...
However not available in the stable branch yet.
I will see to it. Thanks again!
---
*B. R.*

On Sat, Apr 11, 2015 at 2:10 PM, itpp2012 <nginx-forum@nginx.us> wrote:

> Page 18 from nginx for Windows - documentation 1.3;
>
> map $request_uri $loggablevhts {
> default 1;
> /ngxvtstatus 0; # zero=do not log
> /vtsvalues.js 0; # zero=do not log
> /vtsvalues-eop.js 0; # zero=do not log
> /ngxvtstatus/format/json 0; # zero=do not log
> }
> map $remote_addr $lcladdrvhts {
> default 1;
> ~^(127.0.0.*)$ 0; # zero=do not log
> }
>
> # don't log vhts entries when request is local or from management interface
> map $loggablevhts$lcladdrvhts $loggable {
> default 0;
> ~1 1;
> }
>
> access_log /path/to/access.log combined if=$loggable;
>
> “A request will not be logged if the (IF) condition evaluates to "0" or an
> empty string”
>
> Two simple ‘maps’ which are then combined tested in the third ‘map’ which
> is
> used in the
> IF evaluation of the log directive.
>
> Tweak, change, add your own stuff with $request
>
> See also nginx-simple-WAF.conf in the nginx for Windows release archives.
>
> Posted at Nginx Forum:
> http://forum.nginx.org/read.php?2,257961,257964#msg-257964
>
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