mik-laj commented on issue #8171: Handle missing object in webserver URL: https://github.com/apache/airflow/issues/8171#issuecomment-612939805 It should be something similar. The most important thing is that no mushrooms appear, but user-readable error messages. For example: When you enter following address: http://localhost:28080/tries?dag_id=example_automl_text_sentiment2&days=30 http://localhost:28080/landing_times?dag_id=example_automl_text_sentiment2&days=30 http://localhost:28080/gantt?dag_id=example_automl_text_sentiment2 http://localhost:28080/dag_details?dag_id=example_automl_text_sentiment2 http://localhost:28080/code?dag_id=example_automl_text_sentiment2 you will see error screen similar:  However, if you go to the link: http://localhost:28080/tree?dag_id=example_automl_text_cls2 you will see following error message:  This should be standardized and a clear message should always be displayed to the user.
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