Templates or workarounds when serving Panel through Flask

[rsdenijs]

Two years ago the consensus seemed to be this is not possible

Panel Templates vs Bokeh server document

I have a flask app that serves bokeh server documents: def route... return render_template( 'base.html', script=server_document(url=url, arguments=kwargs)) I adopted panel early on before it had templates, that we knew of, and now I’d like to be able to serve templated panel dashboards too. I’m able to get the template to display correctly within a jupyter notebook, (we usually serve the bokeh apps with panel serve), but when it’s embedded in the Flask app it doesn’t serve correctly. …

Since some time has passed, I thought it may be that things have changed in the meantime.

The problem seems to stem from the fact that the flask embedding strategy from https://github.com/bokeh/bokeh/blob/3.2.0/examples/server/api/flask_embed.py relies on letting the bokeh app generate the html, bypassing the templating.

@app.route('/', methods=['GET'])
def bkapp_page():
    script = server_document('http://localhost:5006/bkapp')
    return render_template("embed.html", script=script, template="Flask")


def bk_worker():
    server = Server({'/bkapp': bkapp}, io_loop=IOLoop(), allow_websocket_origin=["localhost:8000"])
    server.start()
    server.io_loop.start()

• Are the panel serve internals exposed in a way that would allow us to do something smarter here?
• If not, would it be possible to inject parts of the app on multiple locations of the page? For example, one could create a sidebar in the static template embed.html and place some widgets there. I can see how maybe it would work with multiple bk_workers but you’d want them to share the internal state.