Hey there,\nI am currently trying to set up SuperSet with `docker-compose`. I am using the most recent version. I want to connect a MySQL-Database with this URL: `<mysql://user>:password@123.456.78.9:1234/dbname` but I get the error `ERROR: Connection failed, please check your connection settings` and the log shows:\n```DEBUG:superset.models.core:Database.get_sqla_engine(). Masked URL: <mysql+mysqldb://userm:XXXXXXXXXX@123.456.78.9:1234/dbname>\nsuperset_app             | WARNING:superset.views.core:Connection failed\nsuperset_app             | XXIPXX - - [22/Sep/2020 12:33:10] "POST /superset/testconn HTTP/1.1" 400 -\nsuperset_app             | INFO:werkzeug:XXIPXX - - [22/Sep/2020 12:33:10] "POST /superset/testconn HTTP/1.1" 400 -```\n The issue seems similar to <https://github.com/apache/incubator-superset/issues/10993|this one on GitHub> .\nThe MySQL-Database is local and I am able to connect to it via the terminal, so the credentials should be fine.\nDo you have an idea what is going wrong? Thank you in advance :slightly_smiling_face: