Fresh install, can't figure out how to view about dask-labextension HOT 6 CLOSED

Thanks for the reports @stsievert and @dhirschfeld, it looks like the problems you are running into are a result of some of the waffling I had regarding the name of the extension. I'm working up a fix right now.

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I tried that (and different browsers, different installation methods and different Dask dashboard URLs), but no luck. When I start up JupyterLab, I get a message

# right below "Copy/paste this URL into your browser when you connect ..."
[W 18:56:10.034 LabApp] 404 GET /lab/api/settings/jupyterlab-dask:plugin?1535846169700 (::1): Schema not found: '/Users/scott/anaconda3/share/jupyter/lab/schemas/jupyterlab-dask/plugin.json'
[W 18:56:10.035 LabApp] Schema not found: '/Users/scott/anaconda3/share/jupyter/lab/schemas/jupyterlab-dask/plugin.json'
[W 18:56:10.037 LabApp] 404 GET /lab/api/settings/jupyterlab-dask:plugin?1535846169700 (::1) 4.93ms referer=None

When I visit /Users/scott/anaconda3/share/jupyter/lab/schemas/, I see a directory named dask-labextension, not jupyterlab-dask. dask-labextension contains plugin.json

It looks like Jupyter is looking for a directory jupyterlab-dask, not dask-labextension. I tried copy/pasting dask-labextension to jupyterlab-dask. That got rid of the error message above, but didn't resolve the issue (the buttons are still greyed out).

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I also can't get this extension to work.

I also get a 404 on jupyterlab-dask

/user/dhirschfeld/lab/api/settings/jupyterlab-dask:plugin?1535956133900 404 (Not Found)

When I enter the dask dashboard url it then says it's not valid:

widget.js:130 http://server:59863 does not appear to host a valid Dask dashboard
d.testDaskDashboard.then.r @ widget.js:130
Promise.then (async)
set url @ widget.js:123
handleEvent @ widget.js:179

...even though opening the bokeh dashboard http://server:59863/status in a new tab works fine.

I also start to receive a lot to CORB errors:

18 Cross-Origin Read Blocking (CORB) blocked cross-origin response <URL> with MIME type text/html. See <URL> for more details.

Cross-Origin Read Blocking (CORB) blocked cross-origin response http://server:59863/statics/images/dask-logo.svg?1535956405943 with MIME type text/html. See https://www.chromestatus.com/feature/5629709824032768 for more details.

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@dhirschfeld we are aware that there are potential CORS issues, and are still thinking through what best-practices for those should be. You might try something similar to what is done in this example with nbserverproxy, which proxies the dashboard to be under the notebook server origin.

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Thanks @ian-r-rose. I've been meaning to check out nbserverproxy so I'll bump that up the priority list!

Currently users have access to the dask cluster from the enterprise network but that may not always be the case so I had thought to use nbserverproxy to work around that restriction in any case

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