Hello, 
  
i have Dahua IPC-HDBW4331R-as and i'm try to add it to home assistant. 
  
i find many to link for URL but non if them work via home assistant. 
  
http://user:password@ip_address/cgi-bin/snapshot.cgi?  
  
also 
 http://192.168.31.13/onvifsnapshot/media_service/snapshot?channel=1&subtype=0 
  
work fine on browser  
  
i'M with ONVIF Version2.42 and Software Version2.420.0000.21.R, Build Date: 2016-07-24 
  
any help will be nice, Thanks!!