How can I change the debug-level and format for the Quart (i.e. hypercorn) logger?

Question

I'm trying to set the level and format for the loggers used by the Quart module the way I did it successfully for other 'foreign' loggers:

• by running basicConfig and implicitly setting up the root-logger or later
• by running logging.getLogger("urllib3.connectionpool").setLevel(logging.INFO) to get and modify an existing logger

However those approaches don't work for the loggers spawned by Quart. Neither are those affected by basicConfig nor can I set the level. Output will always look like this:

[2023-07-28 16:17:12 +0200] [1254610] [INFO] Running on http://0.0.0.0:5432 (CTRL + C to quit)

Setting breakpoints in logging/__init__.py let the program break on log messages by hypercorn.error (so it seems to use the same module), but setting the level like this

logging.getLogger("hypercorn.error").setLevel(logging.WARNING)

doesn't have any effect.

The doc says I should use dictConfig, so I've added

dictConfig({
    'version': 1,
    'loggers': {
        'quart.app': {'level': 'ERROR'},
        'hypercorn.error': {'level': 'ERROR'},
    },
})

.. no effect

I found https://github.com/pgjones/hypercorn/issues/120, and tried

logger = logging.getLogger("hypercorn.error")
logger.addHandler(my_own_handler)
logger.setLevel(logging.WARNING)
logger.propagate = False

but also without effect.

What else can I try?