I may have mixed this with special upstream variables, eg:
$upstream_http_something. When upstream response header doesn't existing,
the variable was logged - in the nginx access logs.

On Mon, Nov 30, 2020 at 5:28 AM Maxim Dounin <mdounin@mdounin.ru> wrote:

> Hello!
>
> On Sun, Nov 29, 2020 at 05:35:19AM -0800, Frank Liu wrote:
>
> > If I create a variable, default to blank:
> >
> > map upstream_env $upstream_env {
> > default "";
> > }
> >
> > and log it in access log (log_format has $upstream_env). I see a "-" in
> the
> > log file, which is as expected, but for a 2-way SSL virtual host, I don't
> > see the "-", just blank. Is that a bug?
>
> The above snippet is expected to always result in "", as the above
> variable has the value "". If it results in "-" being logged for
> you, this is certainly not something expected, please share full
> configuration which demonstrates the problem.
>
> --
> Maxim Dounin
> http://mdounin.ru/
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