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diff --git a/config.env.py b/config.env.py
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+import secrets
+import os
+
+# Values in this file are loaded into the flask app instance, `demo.APP` in this
+# demo. This file sources values from the environment if they exist, otherwise a
+# set of defaults are used. This is useful for keeping secrets secret, as well
+# as facilitating configuration in a container. Defaults may be overriden either
+# by defining the environment variables, or by creating a `config.py` file that
+# contains locally set secrets or config values.
+
+
+# Defaults for flask configuration
+IP = os.environ.get('IP', '127.0.0.1')
+PORT = os.environ.get('PORT', 5000)
+SERVER_NAME = os.environ.get('SERVER_NAME', 'localhost:5000')
+SECRET_KEY = os.environ.get('SESSION_KEY', default=''.join(secrets.token_hex(16)))
+