404 in a eventManager.cgi attach call - incorrect url construction

[scaytrase]

Got this from HA logs

source: custom_components/dahua/client.py:741

404, message='Not Found', url='http://192.168.3.65/:80/cgi-bin/eventManager.cgi?action=attach&codes=%5BVideoMotion,CrossLineDetection,AlarmLocal,VideoLoss,VideoBlind,AudioMutation,CrossRegionDetection,SmartMotionHuman,SmartMotionVehicle%5D&heartbeat=5'

Looks like URL is not properly constructed - port :80 comes after / which makes it part of the path leading to 404

Traceback (most recent call last):
  File "/config/custom_components/dahua/client.py", line 741, in stream_events
    response.raise_for_status()
    ~~~~~~~~~~~~~~~~~~~~~~~~~^^
  File "/usr/local/lib/python3.13/site-packages/aiohttp/client_reqrep.py", line 1161, in raise_for_status
    raise ClientResponseError(
    ...<5 lines>...
    )
aiohttp.client_exceptions.ClientResponseError: 404, message='Not Found', url='http://192.168.3.65/:80/cgi-bin/eventManager.cgi?action=attach&codes=%5BVideoMotion,CrossLineDetection,AlarmLocal,VideoLoss,VideoBlind,AudioMutation,CrossRegionDetection,SmartMotionHuman,SmartMotionVehicle%5D&heartbeat=5'