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We have an httpd.conf that contains the following log format and uses the %u token for logging the remote user:

LogFormat "%h %l %u %t \"%r\" %>s %b \"%{Referer}i\" \"%{User-Agent}i\" %D" combined
CustomLog "|/usr/sbin/rotatelogs /var/log/httpd/access.log.%Y%m%d 86400" combined

Unfortunately, no user identifier ever appears in the access log. The third token in every logged line just contains a hyphen instead of the user, like this:

192.168.15.124 - - [20/Apr/2018:12:06:49 +0200] "GET /some/resource" ...

Does anyone know how the value of %u is set by Apache? Is there a particular HTTP header for which %u is replaced? I explicitly set a few headers like X-Remote-User, Remote-User or just User, but I keep just seeing hyphens...

Any clues about how Apache sets the %u would be highly appreciated.

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This field corresponds to a username used in Authorization HTTP header used for The 'Basic' HTTP Authentication Scheme.

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  • I actually see Authorization headers, too. We have two levels of Apache proxies, the first one does the authorization and the second one just 'reroutes' traffic to different application servers/backends. On the first proxy, the user IDs are all logged as expected, but on the second one they are not.
    – dokaspar
    Apr 20 '18 at 10:44

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