can't run JupyterDash.infer_jupyter_proxy_config() in Jupyterhub

[statiksof]

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.

[zakandrewking]

We are seeing a similar issue. Jupyterhub never responds to this request:

jupyter-dash/jupyter_dash/comms.py

Line 16 in 351cb7c

_dash_comm.send({

[LukaPitamic]

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

[datainvestor]

Any progress on this issue?

[LukaPitamic]

me waiting also ;)

[gravelrider]

Same here.
Are there any updates on this issue?

[edmundhighcock]

+1

[edmundhighcock]

I have a docker MWE to replicate this:

FROM python@sha256:743d52e1c66f456f40d1e673fe580d0ebda7b97a926c81678dedfed2d4a3fd31

RUN apt update

# Install jupyterhub
RUN apt install -y nodejs npm && pip install jupyterhub && \
    npm install -g configurable-http-proxy && pip install jupyterlab

RUN pip install jupyter-dash && jupyter lab build && \
    pip install jupyter-server-proxy && \
    pip install jupyter-dash && \
    jupyter lab build

RUN mkdir -p /jupyter_keys && \
    cd /jupyter_keys && \
    openssl req -x509 -newkey rsa:4096 -keyout key.pem -out cert.pem -sha256 -days 365 -nodes -subj "/C=IE/ST=County Dublin/L=Dublin/O=MyOrg/OU=JupyterPeeps/CN=Jupyter Hub" 

RUN useradd testuser && echo "testuser:testpassword" | chpasswd && mkdir -p /home/testuser && chown testuser /home/testuser
CMD jupyterhub --ip 0.0.0.0 --port 443 --ssl-key /jupyter_keys/key.pem --ssl-cert /jupyter_keys/cert.pem  &  sleep 1720d

Build this dockerfile, then launch it, connect as testuser and try running this in a new notebook:

from jupyter_dash import JupyterDash

JupyterDash.infer_jupyter_proxy_config()

[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...