empty variable in access log

[Frank Liu]

Hi,

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? For now, if I change above map to :

   map upstream_env $upstream_env {
       default "-";
   }

I can then see the - in the access log for 2-way SSL virtual host.

Thanks!
Frank
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