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docs: document FLASK_APP_MUTATOR (#16286)

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Ke Zhu
2021-08-20 12:54:46 -04:00
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docs/src/pages/docs/installation/configuring.mdx
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@@ -201,6 +201,25 @@ CUSTOM_SECURITY_MANAGER = CustomSsoSecurityManager
]
```
### Flask app Configuration Hook
`FLASK_APP_MUTATOR` is a configuration function that can be provided in your environment, receives
the app object and can alter it in any way. For example, add `FLASK_APP_MUTATOR` into your
`superset_config.py` to setup session cookie expiration time to 24 hours:
```
def make_session_permanent():
'''
Enable maxAge for the cookie 'session'
'''
session.permanent = True
# Set up max age of session to 24 hours
PERMANENT_SESSION_LIFETIME = timedelta(hours=24)
def FLASK_APP_MUTATOR(app: Flask) -> None:
app.before_request_funcs.setdefault(None, []).append(make_session_permanent)
```
### Feature Flags
To support a diverse set of users, Superset has some features that are not enabled by default. For