I write tutorials and do lots of live teaching and gravitate mostly to using Jupyter Notebooks, which allow for text and code to be integrated together in one. Using dash on a local instance of Jupyter is essentially no different than using it from a normal .py file.

But, when teaching to people that have no local jupyter instance or don't even have python installed, I've turned to Binder which relies on JupyterHub.

It took some searching, but I found some github issues and forum posts that informed me I had to set requests_pathname_prefix of the config dictionary like this.

port = 9999
base_prefix = '{}proxy/{}/'.format(os.environ['JUPYTERHUB_SERVICE_PREFIX'], port)
url = 'https://hub.gke.mybinder.org{}'.format(base_prefix)
app.config.update({'requests_pathname_prefix': base_prefix})
app = dash.Dash()
app.run_server(host='0.0.0.0', port=port)

Would be great if this was officially documented somewhere. Thanks and this is a great product. I'm doing a meetup on it in Houston on Jan 2 (apologies if this is self promotion, so no link provided).