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Passenger standalone should be configurable by environment variables #1661
Especially on heroku, but in general, configuring standalone with command line switches or a json config file does not work well.
A perfect example is configuring the union station key. I only want to set that in the production environment. If this could be set via an environment variable setup would be trivial - only set the UNION_STATION_KEY env var on the production servers.
As it stands I can only think of two was to only enable unionstation on production.