allow custom HTTP headers (e.g. bearer token) to Mapbox layer source

Hi!

I wanted to display a Mapbox layer that requires authentication through bearer tokens, i.e. when doing something like:

fig.update_layout(
    mapbox_style="white-bg",
    mapbox_layers=[
        {
            "below": 'traces',
            "sourcetype": "raster",
            "sourceattribution": "My private ortho",
            "source": [
                "https://my_private_source.com/MapServer/tile/{z}/{y}/{x}"
            ]
        }
      ]
)

I need to pass custom HTTP headers to each tile request. In JavaScript, this can be easily achieved with the Mapbox API thanks to transformRequest (see here):

const map = new mapboxgl.Map({
  container: 'map',
  center: [2.35, 48.86],
  zoom: 13,
  transformRequest: (url, resourceType) => {
    if (url.startsWith('https://my_private_source.com')) {
      return {
        url: url,
        headers: { 'Authorization': 'Bearer ' + my_private_token }
      }
    }
  }
});

However, this does not seem supported by plotly.py, or am I missing something? With some pointers I could work on a PR, but I'm not sure where to start in the code base.

L’issue ne mentionne aucun fichier ni test. Commencez par retracer la manière dont plotly.py sérialise mapbox_layers et dont la carte JavaScript demande les tuiles raster, puis comparez ce parcours avec l’exemple transformRequest fourni en lien. C’est terminé lorsque des headers personnalisés peuvent être fournis pour chaque requête de tuiles de couche Mapbox et que le comportement est couvert par des tests appropriés.