Nginx Map how to check value if empty

[B.R.]

That is because it is not: your eyes deceived you having a too quick look
at the log line.

Your 'empty' variables are actually showing the value '-' in this log line.
It probably does not help debugging to have static '-' mixed in the format
of your log lines where you put them.
---
*B. R.*

On Sun, Mar 5, 2017 at 10:00 PM, c0nw0nk <nginx-forum at forum.nginx.org>
wrote:

> Francis Daly Wrote:
> -------------------------------------------------------
> > On Fri, Mar 03, 2017 at 10:47:26AM -0500, c0nw0nk wrote:
> >
> > Hi there,
> >
> > > map $http_cf_connecting_ip $client_ip_from_cf {
> > > default $http_cf_connecting_ip;
> > > }
> > >
> > > How can I make it so if the client did not send that $http_ header
> > it makes
> > > $client_ip_from_cf variable value = $binary_remote_addr
> > >
> > > Not sure how to check in a map if that http header is present.
> >
> > If the http header is absent, the matching variable is empty. So it
> > will
> > have the value "".
> >
> > Use that as the first half of your "map" pair.
> >
> >       f
> > --
> > Francis Daly        francis at daoine.org
> > _______________________________________________
> > nginx mailing list
> > nginx at nginx.org
> > http://mailman.nginx.org/mailman/listinfo/nginx
>
>
> Hey Francis,
>
>
> HTTP BLOCK
> log_format cf_custom 'CFIP:$http_cf_connecting_ip - $remote_addr -
> $remote_user [$time_local]  '
> '"$request" Status:$status $body_bytes_sent '
> '"$http_referer" "$http_user_agent"'
> '$http_cf_ray';
> map $status $loggable {
> ~^[23]  0;
> default 1;
> }
> access_log logs/access.log cf_custom if=$loggable;
>
> map $remote_addr $client_ip_from_cf {
> default $remote_addr;
> }
>
>
> Access.log output
> CFIP:- - 10.108.22.40 - - [05/Mar/2017:21:27:50 +0100]  "GET
>
>
> Any idea why the remote_addr is empty surely it should display to me the
> clients IP address i am not proxying traffic or anything like that. I
> expected to see an IP there instead it seems the value is empty.
>
> Posted at Nginx Forum: https://forum.nginx.org/read.p
> hp?2,272744,272766#msg-272766
>
> _______________________________________________
> nginx mailing list
> nginx at nginx.org
> http://mailman.nginx.org/mailman/listinfo/nginx
>
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