Is there a HTTP API spec for Hero 8 Black?

[Hubro]

I know this project only supports Hero 9 Black and upwards (tarnation!), but I noticed that the Hero 8 Black works in much the same way as described in the HTTP 2.0 spec: https://gopro.github.io/OpenGoPro/http_2_0

I can connect the camera to my PC with USB and it creates a network interface. On the network interface, I can ping the camera and send commands over HTTP. I can put the camera in webcam mode using /gp/gpWebcam/START?res=1080, at which point it starts a UDP video stream.

The only reason I know this is because of random tips I've found when Googling around. I have absolutely no idea what else I can do with the API. None of the endpoints documented in the HTTP specification v2.0 work, so I guess this camera runs v1.0?

Does anybody know where I can find documentation for the HTTP API on the Hero 8 Black?