[google-cloud-sql-discuss] "Can't connect to MySQL server on 'localhost' ([Errno 111] Connection refused)")

My application is running.

I can run it and connect locally when point to ip on CloudSql

SQLALCHEMY_DATABASE_URI = "mysql+pymysql://{}:{}@{}/{}".format(db_user,db_pass,db_host,db_name)

When I change it and run it on server:

SQLALCHEMY_DATABASE_URI = "mysql+pymysql:///unix_socket=/{}/{}".format(db_user,db_pass,db_name,db_socket_dir,cloud_sql_connection_name)

I got:

sqlalchemy.exc.OperationalError: (pymysql.err.OperationalError) (2003, "Can't connect to MySQL server on 'localhost' ([Errno 111] Connection refused)")

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