Font Awesome Brand Icons do not work

Describe the bug

Brand icons from font-awesome do not render correctly.

To Reproduce

from flask import Flask, render_template_string

import folium

app = Flask(__name__)


@app.route("/")
def fullscreen():
    """Simple example of a fullscreen map."""
    m = folium.Map(location=[41, -71], zoom_start=4)

    folium.Marker(location=[41, -72],
        icon=folium.Icon(prefix='fa', icon='fa-heart')).add_to(m)

    folium.Marker(location=[41, -75],
        icon=folium.Icon(prefix='fa', icon='fa-bluetooth')).add_to(m)

    return m.get_root().render()


if __name__ == "__main__":
    app.run(debug=True)

Expected behavior

All icons to render correctly

Environment (please complete the following information):

• Browser: Firefox 140.15.0esr and Chromium 152.0.7977.64
• Jupyter Notebook or html files? Flask
• Python version: sys.version_info(major=3, minor=13, micro=5, releaselevel='final', serial=0)
• folium version: 0.19.5+dfsg
• branca version: 0.8.1

Additional context

It seems that the appropriate web font is not loaded. If I go to Web Developer Tools -> Inspector -> Fonts -> All Fonts on Page only https://cdn.jsdelivr.net/npm/@fortawesome/fontawesome-free@6.2.0/webfonts/fa-solid-900.woff2 is loaded and I believe the glyph for bluetooth is in https://cdn.jsdelivr.net/npm/@fortawesome/fontawesome-free@6.2.0/webfonts/fa-brands-400.woff2 so it isn't rendered correctly.

Screenshots

folium is maintained by volunteers. Can you help making a fix for this issue? Probably not

Commencez par exécuter la reproduction Flask de l’issue et inspectez le HTML généré ainsi que les polices web Font Awesome chargées dans Firefox ou Chromium. Suivez la façon dont folium.Icon traite le préfixe fa et comparez l’icône pleine heart avec l’icône de marque bluetooth. Le travail est terminé lorsque les deux marqueurs s’affichent correctement et qu’une vérification de régression couvre les icônes de marque.