[BUG] Issue connecting with bokeh serve (using websocket origin) under 3.2.0

[Latill]

Software versions

Python version : 3.9.2 (default, Feb 28 2021, 17:03:44)
IPython version : 7.20.0
Tornado version : 5.1.1
Bokeh version : 3.2.0
BokehJS static path : /home/dthillou/.local/lib/python3.9/site-packages/bokeh/server/static
node.js version : (not installed)
npm version : (not installed)
Operating system : Linux-5.10.0-23-amd64-x86_64-with-glibc2.31

Browser name and version

Chrome Version 114.0.5735.198 (but same issue in Egde)

Jupyter notebook / Jupyter Lab version

No response

Expected behavior

Any app launched using the --allow-websocket-origin argument.

Pattern in 3.1.0 (working)

Application working, with:

Hovering on the js link, I get the full address from where he fetched it, and it is the host indicated in websocket-origin

And everything works.

Observed behavior

Pattern in 3.2.0 (just calling python3 -m pip install bokeh==3.2.0 in between)

Application fails to load, without log on bokeh serve side, and with a fetch resources error on browser console side:

As you can see, he seemed to have not forwarded the request to the websocket origin, but instead went on with ‘localhost’, hence the fail.

2 additional checks:

• Opening the app from a browser on the app host machine works, as the localhost request for resources logically works there.
• Taking the resource request address e.g. http://localhost:12007/static/js/bokeh.min.js?v=c836b057bc9b401d63918fcc71d81351 , replacing localhost by the right remote websocket origin, and trying to open it directly in browser works, it returns the script. So with the right address the server let it through ok.

So it seems to me there was a regression in 3.2.0, with the resource request not being forwarded anymore to the websocket origin host.

Example code

from bokeh.models.widgets import Div
from bokeh.io import curdoc
curdoc().add_root(Div(text="test"))

Stack traceback or browser console output

App is launched using the --allow-websocket-origin argument

Issue already submited on https://discourse.bokeh.org/t/issue-connecting-with-bokeh-serve-under-3-2-0/10582

Screenshots

No response

[mattpap]

using websocket origin

If the main bokehjs bundle doesn't load, then this has no effect, because websockets won't be set up otherwise. This is almost certainly a duplicate of earlier issues, specifically #13170, which is a side effect of PR #13041.