I just installed flask-tryton from PyPI (flask-tryton · PyPI) and put the example code into a Python file and started the server. Everything works except the users route. Using an url like http://localhost:5000/users/1,4 gives an HTTP 200 but no data.
Did a bit of digging, and it seems the ids got lost somewhere in the flask-tryton package. I’m using Python 3.9.6 with Tryton 6.4 and flask-tryton 0.11.0