Flower Shows "Visit me at http://0.0.0.0:0" with --port=0

[woutdenolf]

Description

When starting Flower with Celery using a dynamic port (--port=0), Flower logs the URL as:

celery -A tasks.app flower --port=0
[I 250816 16:10:10 command:168] Visit me at http://0.0.0.0:0

The port in the URL shows as 0, which is confusing. This happens because --port=0 tells Tornado to let the OS pick a free port, but Flower prints the log before Tornado binds to the port. The actual port is chosen at runtime and isn’t automatically reflected in the log.

Expected Behavior

The log should display the actual port assigned by the OS, e.g.:

[I 250816 16:10:10 command:168] Visit me at http://0.0.0.0:52345