Actually this is related to this : Plotly.js CDN down?
I found a working solution (for Dash app):
- Download this locally : https://raw.githubusercontent.com/plotly/plotly.js/master/dist/topojson/world_110m.json
- Add in the code : plotlyConfig = {‘topojsonURL’:‘http://127.0.0.1:8050/assets/’}
- Modify in the code : dcc.Graph(figure=fig, config=plotlyConfig)