What Environment is Plack running under?

[Mikko Koivunalho]

Is there any way to find out which environment Plack is using in a Middleware or inside an app (inside .psgi file)?
I run plackup and I have the same application running in development, staging and production.

[Mikko Koivunalho]

Question got answered. Using the env var PLACK_ENV, as in https://metacpan.org/pod/distribution/Plack/script/plackup#-E,-env,-the-PLACK_ENV-environment-variable