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Collapsing Empty Variables in Nginx Access Log When Using TAB Delimiter

March 06, 2012 02:00PM
I'm noticing that Nginx's log module is "collapsing" empty log variables primarily when using a TAB (\t) as a delimiter in the access log.

For example, if I use the following:

log_format main '$server_name $msec $remote_addr $cookie_x $cookie_y $cookie_z $status';

And a request does not have any cookies set (so $cookie_x, $cookie_y, and $cookie_z would be empty), then I would get a log line like this:

myserver.com 1331049809.478 10.10.15.50 - 200

I was expecting:

myserver.com 1331049809.478 10.10.15.50 - - - 200

The same thing happens with the $http_referer (when not set by the UA) and $upstream_addr (when serving static files).

Here's a link to my access log configuration:
https://gist.github.com/1988173

I'm using Nginx v1.1.16.

Has anyone experienced this before?
Subject Author Posted

Collapsing Empty Variables in Nginx Access Log When Using TAB Delimiter

adamchal March 06, 2012 02:00PM

Re: Collapsing Empty Variables in Nginx Access Log When Using TAB Delimiter

Maxim Dounin March 06, 2012 04:18PM

Re: Collapsing Empty Variables in Nginx Access Log When Using TAB Delimiter

adamchal March 07, 2012 05:14PM

Re: Collapsing Empty Variables in Nginx Access Log When Using TAB Delimiter

adamchal March 08, 2012 05:14PM

Re: Collapsing Empty Variables in Nginx Access Log When Using TAB Delimiter

adamchal March 09, 2012 12:23PM



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