Not working with jupyter-server-proxy

Environment information (required)

Diagnostics

Diagnostics output

--- check: autoidentify
INFO: diagnose_tensorboard.py version e43767ef2b648d0d5d57c00f38ccbd38390e38da

--- check: general
INFO: sys.version_info: sys.version_info(major=3, minor=8, micro=10, releaselevel='final', serial=0)
INFO: os.name: posix
INFO: os.uname(): posix.uname_result(sysname='Linux', nodename='*********', release='5.4.72-microsoft-standard-WSL2', version='#1 SMP Wed Oct 28 23:40:43 UTC 2020', machine='x86_64')
INFO: sys.getwindowsversion(): N/A

--- check: package_management
INFO: has conda-meta: False
INFO: $VIRTUAL_ENV: None

--- check: installed_packages
INFO: installed: tensorboard==2.8.0
INFO: installed: tensorflow==2.7.0
INFO: installed: tensorflow-estimator==2.7.0
INFO: installed: tensorboard-data-server==0.6.1

--- check: tensorboard_python_version
INFO: tensorboard.version.VERSION: '2.8.0'

--- check: tensorflow_python_version
INFO: tensorflow.__version__: '2.7.0'
INFO: tensorflow.__git_version__: 'v2.7.0-rc1-69-gc256c071bb2'

--- check: tensorboard_data_server_version
INFO: data server binary: '/home/kun/.local/lib/python3.8/site-packages/tensorboard_data_server/bin/server'
INFO: data server binary version: b'rustboard 0.6.1'

--- check: tensorboard_binary_path
INFO: which tensorboard: b'/home/kun/.local/bin/tensorboard\n'

--- check: addrinfos
socket.has_ipv6 = True
socket.AF_UNSPEC = <AddressFamily.AF_UNSPEC: 0>
socket.SOCK_STREAM = <SocketKind.SOCK_STREAM: 1>
socket.AI_ADDRCONFIG = <AddressInfo.AI_ADDRCONFIG: 32>
socket.AI_PASSIVE = <AddressInfo.AI_PASSIVE: 1>
Loopback flags: <AddressInfo.AI_ADDRCONFIG: 32>
Loopback infos: [(<AddressFamily.AF_INET6: 10>, <SocketKind.SOCK_STREAM: 1>, 6, '', ('::1', 0, 0, 0)), (<AddressFamily.AF_INET: 2>, <SocketKind.SOCK_STREAM: 1>, 6, '', ('127.0.0.1', 0))]
Wildcard flags: <AddressInfo.AI_PASSIVE: 1>
Wildcard infos: [(<AddressFamily.AF_INET: 2>, <SocketKind.SOCK_STREAM: 1>, 6, '', ('0.0.0.0', 0)), (<AddressFamily.AF_INET6: 10>, <SocketKind.SOCK_STREAM: 1>, 6, '', ('::', 0, 0, 0))]

--- check: readable_fqdn
INFO: socket.getfqdn(): '************'

--- check: stat_tensorboardinfo
INFO: directory: /tmp/.tensorboard-info
INFO: os.stat(...): os.stat_result(st_mode=16895, st_ino=54451, st_dev=2064, st_nlink=2, st_uid=1000, st_gid=1000, st_size=4096, st_atime=1643115809, st_mtime=1643122711, st_ctime=1643122711)
INFO: mode: 0o40777

--- check: source_trees_without_genfiles
INFO: tensorboard_roots (1): ['/home/kun/.local/lib/python3.8/site-packages']; bad_roots (0): []

--- check: full_pip_freeze
INFO: pip freeze --all:
absl-py==1.0.0
aiohttp==3.8.1
aiosignal==1.2.0
altair==4.1.0
anyio==3.4.0
argon2-cffi==21.2.0
argon2-cffi-bindings==21.2.0
astor==0.8.1
astunparse==1.6.3
async-timeout==4.0.1
attrs==21.2.0
awscli==1.22.26
Babel==2.9.1
backcall==0.2.0
backports.zoneinfo==0.2.1
base58==2.1.1
black==21.12b0
bleach==4.1.0
blinker==1.4
bokeh==2.4.2
botocore==1.23.26
Brotli==1.0.9
cachetools==4.2.4
certifi==2021.10.8
cffi==1.15.0
charset-normalizer==2.0.9
click==8.0.3
colorama==0.4.3
colorlog==6.6.0
command-not-found==0.3
cycler==0.11.0
dash==2.0.0
dash-bootstrap-components==1.0.1
dash-colorscales==0.0.4
dash-core-components==2.0.0
dash-daq==0.5.0
dash-html-components==2.0.0
dash-table==5.0.0
debugpy==1.5.1
decorator==5.1.0
defusedxml==0.7.1
docutils==0.15.2
dtale==1.61.1
easydev==0.12.0
entrypoints==0.3
et-xmlfile==1.1.0
fitter==1.4.0
flake8==4.0.1
Flask==2.0.2
Flask-Compress==1.10.1
flask-ngrok==0.0.25
flatbuffers==2.0
fonttools==4.28.3
frozenlist==1.2.0
future==0.18.2
gast==0.4.0
ghp-import==2.0.2
gitdb==4.0.9
GitPython==3.1.24
google-auth==1.35.0
google-auth-oauthlib==0.4.6
google-pasta==0.2.0
grpcio==1.43.0
h5py==3.6.0
idna==3.3
importlib-metadata==4.8.2
importlib-resources==5.4.0
ipykernel==6.6.0
ipython==7.30.1
ipython-genutils==0.2.0
ipywidgets==7.6.5
itsdangerous==2.0.1
jedi==0.18.1
Jinja2==3.0.3
jmespath==0.10.0
joblib==1.1.0
json5==0.9.6
jsonschema==4.2.1
jupyter==1.0.0
jupyter-client==7.1.0
jupyter-console==6.4.0
jupyter-core==4.9.1
jupyter-server==1.12.1
jupyter-server-proxy==3.2.1
jupyterlab==3.2.4
jupyterlab-pygments==0.1.2
jupyterlab-server==2.8.2
jupyterlab-widgets==1.0.2
kaleido==0.2.1
keras==2.7.0
Keras-Preprocessing==1.1.2
kiwisolver==1.3.2
libclang==12.0.0
lz4==3.1.10
Markdown==3.3.6
MarkupSafe==2.0.1
matplotlib==3.5.0
matplotlib-inline==0.1.3
mccabe==0.6.1
mergedeep==1.3.4
missingno==0.4.2
mistune==0.8.4
mkdocs==1.2.3
multidict==5.2.0
mypy-extensions==0.4.3
nbclassic==0.3.4
nbclient==0.5.9
nbconvert==6.3.0
nbformat==5.1.3
nest-asyncio==1.5.4
networkx==2.6.3
notebook==6.4.7
numpy==1.21.4
oauthlib==3.1.1
openpyxl==3.0.9
opt-einsum==3.3.0
packaging==21.3
pandas==1.3.4
pandocfilters==1.5.0
panel==0.12.5
param==1.12.0
parso==0.8.3
pathspec==0.9.0
patsy==0.5.2
pexpect==4.8.0
pickleshare==0.7.5
Pillow==8.4.0
pip==21.3.1
platformdirs==2.4.1
plotly==5.4.0
ppscore==1.2.0
prometheus-client==0.12.0
prompt-toolkit==3.0.24
protobuf==3.19.1
ptyprocess==0.7.0
pyarrow==6.0.1
pyasn1==0.4.8
pyasn1-modules==0.2.1
pycodestyle==2.8.0
pycparser==2.21
pyct==0.4.8
pydeck==0.7.1
pyflakes==2.4.0
Pygments==2.10.0
Pympler==0.9
pyparsing==3.0.6
pyrsistent==0.18.0
python-dateutil==2.8.2
pytz==2021.3
pytz-deprecation-shim==0.1.0.post0
pyviz-comms==2.1.0
PyYAML==5.3.1
pyyaml_env_tag==0.1
pyzmq==22.3.0
qtconsole==5.2.1
QtPy==1.11.3
requests==2.26.0
requests-oauthlib==1.3.0
rsa==4.7.2
s3transfer==0.5.0
scikit-learn==0.24.2
scipy==1.7.3
seaborn==0.11.2
Send2Trash==1.8.0
setuptools==45.2.0
setuptools-scm==6.3.2
simpervisor==0.4
simplejson==3.16.0
six==1.16.0
smmap==5.0.0
sniffio==1.2.0
squarify==0.4.3
statsmodels==0.13.1
streamlit==1.2.0
strsimpy==0.2.1
systemd-python==234
tenacity==8.0.1
tensorboard==2.8.0
tensorboard-data-server==0.6.1
tensorboard-plugin-wit==1.8.1
tensorflow==2.7.0
tensorflow-estimator==2.7.0
tensorflow-io-gcs-filesystem==0.23.1
termcolor==1.1.0
terminado==0.12.1
testpath==0.5.0
threadpoolctl==3.0.0
toml==0.10.2
tomli==1.2.2
toolz==0.11.2
tornado==6.1
tqdm==4.62.3
traitlets==5.1.1
typing_extensions==4.0.1
tzdata==2021.5
tzlocal==4.1
ufw==0.36
urllib3==1.26.7
validators==0.18.2
watchdog==2.1.6
wcwidth==0.2.5
webencodings==0.5.1
websocket-client==1.2.1
Werkzeug==2.0.2
wheel==0.34.2
widgetsnbextension==3.5.2
wrapt==1.13.3
xarray==0.20.1
xlrd==2.0.1
yarl==1.7.2
zipp==3.6.0

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Issue description

TensorBoard doesn't work with jupyter-server-proxy. Here are the steps to reproduce:

1. generate logs using the example in https://www.tensorflow.org/tensorboard/get_started
2. Run jupyter-notebook --no-browser --debug
3. Run tensorboard --logdir logs/ and open http://localhost:8888/proxy/6006 but nothing is displayed. Open Dev tools console and see the errors
   
   More log information from jupyter as follows

kun@**********:~/Downloads$ jupyter-notebook --no-browser --debug
[D 15:05:35.412 NotebookApp] Searching ['/mnt/c/Users/kun.liu/Downloads', '/home/kun/.jupyter', '/home/kun/.local/etc/jupyter', '/usr/etc/jupyter', '/usr/local/etc/jupyter', '/etc/jupyter'] for config files
[D 15:05:35.412 NotebookApp] Looking for jupyter_config in /etc/jupyter
[D 15:05:35.412 NotebookApp] Looking for jupyter_config in /usr/local/etc/jupyter
[D 15:05:35.412 NotebookApp] Looking for jupyter_config in /usr/etc/jupyter
[D 15:05:35.412 NotebookApp] Looking for jupyter_config in /home/kun/.local/etc/jupyter
[D 15:05:35.412 NotebookApp] Looking for jupyter_config in /home/kun/.jupyter
[D 15:05:35.412 NotebookApp] Looking for jupyter_config in /mnt/c/Users/kun.liu/Downloads
[D 15:05:35.414 NotebookApp] Looking for jupyter_notebook_config in /etc/jupyter
[D 15:05:35.414 NotebookApp] Looking for jupyter_notebook_config in /usr/local/etc/jupyter
[D 15:05:35.414 NotebookApp] Looking for jupyter_notebook_config in /usr/etc/jupyter
[D 15:05:35.414 NotebookApp] Looking for jupyter_notebook_config in /home/kun/.local/etc/jupyter
[D 15:05:35.414 NotebookApp] Looking for jupyter_notebook_config in /home/kun/.jupyter
[D 15:05:35.414 NotebookApp] Loaded config file: /home/kun/.jupyter/jupyter_notebook_config.py
[D 15:05:35.414 NotebookApp] Loaded config file: /home/kun/.jupyter/jupyter_notebook_config.json
[D 15:05:35.414 NotebookApp] Looking for jupyter_notebook_config in /mnt/c/Users/kun.liu/Downloads
[D 15:05:35.417 NotebookApp] Raising open file limit: soft 1024->4096; hard 4096->4096
[D 15:05:35.423 NotebookApp] Paths used for configuration of jupyter_notebook_config:
/etc/jupyter/jupyter_notebook_config.json
[D 15:05:35.423 NotebookApp] Paths used for configuration of jupyter_notebook_config:
/usr/local/etc/jupyter/jupyter_notebook_config.json
[D 15:05:35.423 NotebookApp] Paths used for configuration of jupyter_notebook_config:
/usr/etc/jupyter/jupyter_notebook_config.json
[D 15:05:35.424 NotebookApp] Paths used for configuration of jupyter_notebook_config:
/home/kun/.local/etc/jupyter/jupyter_notebook_config.d/jupyter-server-proxy-notebookserverextension.json
/home/kun/.local/etc/jupyter/jupyter_notebook_config.d/jupyterlab.json
/home/kun/.local/etc/jupyter/jupyter_notebook_config.d/panel-client-jupyter.json
/home/kun/.local/etc/jupyter/jupyter_notebook_config.json
[D 15:05:35.424 NotebookApp] Paths used for configuration of jupyter_notebook_config:
/home/kun/.jupyter/jupyter_notebook_config.json
[I 2022-01-25 15:05:35.951 LabApp] JupyterLab extension loaded from /home/kun/.local/lib/python3.8/site-packages/jupyterlab
[I 2022-01-25 15:05:35.951 LabApp] JupyterLab application directory is /home/kun/.local/share/jupyter/lab
[I 15:05:35.955 NotebookApp] Serving notebooks from local directory: /mnt/c/Users/kun.liu/Downloads
[I 15:05:35.955 NotebookApp] Jupyter Notebook 6.4.7 is running at:
[I 15:05:35.955 NotebookApp] http://localhost:8888/?token=056a60fb2d328f6662d680554df425a9befe9e2946286290
[I 15:05:35.955 NotebookApp] or http://127.0.0.1:8888/?token=056a60fb2d328f6662d680554df425a9befe9e2946286290
[I 15:05:35.955 NotebookApp] Use Control-C to stop this server and shut down all kernels (twice to skip confirmation).
[C 15:05:35.958 NotebookApp]

To access the notebook, open this file in a browser:
    file:///home/kun/.local/share/jupyter/runtime/nbserver-7646-open.html
Or copy and paste one of these URLs:
    http://localhost:8888/?token=056a60fb2d328f6662d680554df425a9befe9e2946286290
 or http://127.0.0.1:8888/?token=056a60fb2d328f6662d680554df425a9befe9e2946286290

[D 15:05:39.494 NotebookApp] Proxying request to http://localhost:6006/
[D 15:05:39.498 NotebookApp] 200 GET /proxy/6006 (127.0.0.1) 5.340000ms
[D 15:05:39.530 NotebookApp] Using contents: services/contents
[D 15:05:39.564 NotebookApp] Path base/images/favicon.ico served from /home/kun/.local/lib/python3.8/site-packages/notebook/static/base/images/favicon.ico
[D 15:05:39.565 NotebookApp] Path components/jquery-ui/themes/smoothness/jquery-ui.min.css served from /home/kun/.local/lib/python3.8/site-packages/notebook/static/components/jquery-ui/themes/smoothness/jquery-ui.min.css
[D 15:05:39.565 NotebookApp] Path components/jquery-typeahead/dist/jquery.typeahead.min.css served from /home/kun/.local/lib/python3.8/site-packages/notebook/static/components/jquery-typeahead/dist/jquery.typeahead.min.css
[D 15:05:39.566 NotebookApp] Path style/style.min.css served from /home/kun/.local/lib/python3.8/site-packages/notebook/static/style/style.min.css
[D 15:05:39.567 NotebookApp] Path components/es6-promise/promise.min.js served from /home/kun/.local/lib/python3.8/site-packages/notebook/static/components/es6-promise/promise.min.js
[D 15:05:39.567 NotebookApp] Path components/react/react.production.min.js served from /home/kun/.local/lib/python3.8/site-packages/notebook/static/components/react/react.production.min.js
[D 15:05:39.567 NotebookApp] Path components/react/react-dom.production.min.js served from /home/kun/.local/lib/python3.8/site-packages/notebook/static/components/react/react-dom.production.min.js
[D 15:05:39.568 NotebookApp] Path components/create-react-class/index.js served from /home/kun/.local/lib/python3.8/site-packages/notebook/static/components/create-react-class/index.js
[D 15:05:39.568 NotebookApp] Path components/requirejs/require.js served from /home/kun/.local/lib/python3.8/site-packages/notebook/static/components/requirejs/require.js
[D 15:05:39.569 NotebookApp] Path base/images/logo.png served from /home/kun/.local/lib/python3.8/site-packages/notebook/static/base/images/logo.png
[W 15:05:39.570 NotebookApp] 404 GET /proxy/index.js?_file_hash=4a366cbe (127.0.0.1) 40.850000ms referer=http://localhost:8888/proxy/6006
[D 15:05:39.605 NotebookApp] Using contents: services/contents
[W 15:05:39.607 NotebookApp] 404 GET /font-roboto/oMMgfZMQthOryQo9n22dcuvvDin1pK8aKteLpeZ5c0A.woff2 (127.0.0.1) 2.370000ms referer=http://localhost:8888/proxy/6006