The 8080 port is for REST API I think (ref).
Snap uses its own webserver on 6969 port. If you have a 404 error on 6969 port, it means probably that everything works (you just have to change host variable in snap from “localhost” to “poppy.local” as explained in the tutorial notebook).
You can check by this url : http://poppy.local:6969/motors/motors which will display every motors name.
It is not specified in the notebook tutorial but you can also use directly the command
poppy-snap poppy-humanoid --no-browser in a shell to start the snap webserver with an instance of popy-humanoid (see poppy-snap -h for all other options).
Note : I will soon merge the branch snap-dev to master which will change add more blocks, change some blocks names and removing the synchronization loop,
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