can't run JupyterDash.infer_jupyter_proxy_config() in Jupyterhub

I am not able to run JupyterDash.infer_jupyter_proxy_config() in Jupyterhub. There is no error message, cell remains in busy state without any output. Do you have any idea?

• app.run_server() returns 127.0.0.1:8005 which will not work from outside
• app.run_server("mode=jupyterlab") also won’t work
• I also see in the browser console: blocked mixed content: the page was loaded over HTTPS, but requested an insecure frame 'http://ip:8050/'. This request has been blocked; the content must be served over HTTPS.

only thing working is opening the ip:8050 in another tab and I can see the dashboard.

[LukaPitamic]

Same here. We want to develop dash apps in jupyterlab hub (tljh).

[psavery]

It appears that about a year ago, ipykernel changed several functions into coroutines. That includes this function being called in jupyter-dash.

Thus, that function call needs to be changed to maybe something like this:

loop = asyncio.get_running_loop()
loop.run_until_complete(kernel.do_one_iteration())

That would hopefully fix it.

For now, I’m just downgrading ipykernel to 5.5.4 (the version immediately before that change) and the jupyter dash example seems to work…