[Bug] ERR_EMPTY_RESPONSE when accessing the Ray dashboard in Windows

[pcmoritz]

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• I searched the issues and found no similar issues.

Ray Component

Dashboard

What happened + What you expected to happen

When I run the following in Windows on the latest master in an Ipython shell:

import ray
ray.init(include_dashboard=True)

Screenshot with additional logs:

Versions / Dependencies

Python 3.7

Reproduction script

see description above

Anything else

No response

Are you willing to submit a PR?

• Yes I am willing to submit a PR!

[pcmoritz]

The dashboard build artefacts (like index.html etc.) are missing.

If I install npm from nodejs.org/en/download and run the npm commands in https://docs.ray.io/en/latest/development.html#building-ray-on-linux-macos-full to build the dashboard, this error goes away. The PR #19489 was needed to make this work.

[pcmoritz]

fixed by #19575

[marcm-ml]

I still get this error on 1.8.0. Any ideas? I also have to manually downgrade aiohttp from 3.8.0 to 3.7.4post0 for the dashboard agent and logs to appear inside ray log folder. Otherwise the dashboard does not even start.

win10
py3.9
ray[default]==1.8.0
aiohttp==3.7.4post0

running inside virtualenv but also fails outside an env

EDIT: regarding aiohttp see #20261