How to Find Out What Environment (development/production) is Plack running under?

[mikkoi]

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.

[skaji]

You may refer to $ENV{PLACK_ENV}.
https://metacpan.org/pod/distribution/Plack/script/plackup#-E,-env,-the-PLACK_ENV-environment-variable.

[mikkoi]

Thanks. Closing issue.