michalmisiewicz commented on a change in pull request #11970:
URL: https://github.com/apache/airflow/pull/11970#discussion_r518702661



##########
File path: airflow/www/app.py
##########
@@ -66,8 +66,20 @@ def create_app(config=None, testing=False, 
app_name="Airflow"):
     flask_app = Flask(__name__)
     flask_app.secret_key = conf.get('webserver', 'SECRET_KEY')
 
-    session_lifetime_days = conf.getint('webserver', 'SESSION_LIFETIME_DAYS', 
fallback=30)
-    flask_app.config['PERMANENT_SESSION_LIFETIME'] = 
timedelta(days=session_lifetime_days)
+    default_session_lifetime_minutes = 43200
+    if conf.has_option('webserver', 'SESSION_LIFETIME_MINUTES'):
+        session_lifetime_minutes = conf.getint('webserver', 
'SESSION_LIFETIME_MINUTES',
+                                               
fallback=default_session_lifetime_minutes)
+    else:
+        warnings.warn('`SESSION_LIFETIME_DAYS` option from `webserver` section 
has been '

Review comment:
       @XD-DENG @mik-laj Sorry I was busy. I agree with @XD-DENG.  We should 
stop app when we detect removed options in configuration.




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