0.8.2-SNAPSHOT: WebSocket Write EOF 1006

[J.Dadashev]

Hello,

I have created a docker container based on Python 3.7 with matplotlib and
some other libraries.
Here is my Dockerfile:

RUN apt-get update
RUN pip install --upgrade pip
RUN pip install numpy pandas scipy matplotlib
RUN apt-get install -y libaio-dev
RUN apt-get clean

I build the image:
docker build --build-arg http_proxy=http://host:port --build-arg
https_proxy=http:// host:port -t custompy37 .

Then I activate my docker container:
%python.docker activate custompy37

Then I run the attached notebook multiple times.

Eventually I get the error below:

NotebookServer.java[onClose]:372) - Closed connection to 10.39.227.226 :
58950. (1006) WebSocket Write EOF

Questions:
1) Is it a known issue
2) What causes that?

Thanks,
Jim

Python Note.json
Description: application/json