webcam URL works fine standalone but not in Printoid

Hello, my webcam works fine using the URL http://192.168.1.109/webcam/?action=stream
But when I set this URL in Printoid settings, I get a black screen, no error message.
In Printoid server settings, I set local host as 192.162.1.109, so in webcam settings I set the suffix /webcam/?action=stream

Thanks for your help (en français, c'est possible aussi :-) )