I think, but this is untested, the easiest way is just to not run it as development; plackup. Not positive that addresses your case.
-E, --env, the PLACK_ENV environment variable.
Specifies the environment option. Setting this value with -E or --env also writes to the PLACK_ENV environment variable. This allows applications or frameworks to tell which environment setting the application is running on.
# These two are the same
plackup -E deployment
env PLACK_ENV=deployment plackup
Common values are development, deployment, and test. The default value is development, which causes plackup to load the middleware components: AccessLog, StackTrace, and Lint unless --no-default-middleware is set.