XD-DENG commented on issue #4128: [AIRFLOW-3295] Fix potential security issue in DaskExecutor URL: https://github.com/apache/incubator-airflow/pull/4128#issuecomment-435565266 The example below helps show the default value of `require_encryption` is `False`: <img width="802" alt="screen shot 2018-11-03 at 2 43 46 pm" src="https://user-images.githubusercontent.com/11539188/47949036-0acb5480-df77-11e8-8722-5c4bf2e596b9.png"> In Dask documentation http://distributed.dask.org/en/latest/tls.html?highlight=require_encryption#parameters, it shows that `require_encryption` should be `True` is users want to turn on TLS/SSL encryption. <img width="401" alt="screen shot 2018-11-03 at 2 46 08 pm" src="https://user-images.githubusercontent.com/11539188/47949041-423a0100-df77-11e8-845f-aae60ba32de8.png">
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