font_family doesn't work in WEB_BROWSER mode

[m8factorial]

Description

A custom font_family doesn't work when I launch my app in WEB_BROWSER mode

Code example to reproduce the issue:

import flet as ft

def main(page: ft.Page):
    page.fonts = {
        "RobotoSlab": "https://github.com/google/fonts/raw/main/apache/robotoslab/RobotoSlab%5Bwght%5D.ttf"
    }

    t = ft.Text(
        "This is rendered with Roboto Slab, but not in WEB_BROSER mode",
        size=30,
        font_family="RobotoSlab",
        weight=ft.FontWeight.W_100,
    )

    page.add(t)
    page.update()

ft.app(target=main, view=ft.WEB_BROWSER)

Flet version (pip show flet):

Name: flet
Version: 0.10.1
Summary: Flet for Python - easily build interactive multi-platform apps in Python
Home-page: None
Author: Appveyor Systems Inc.
Author-email: hello@flet.dev
License: Apache-2.0
Location: /home/mdo/python/venv/lib/python3.9/site-packages
Requires: copier, flet-runtime, qrcode, packaging, websocket-client, websockets, watchdog
Required-by: 

Operating system:
Debian GNU/Linux 11 (bullseye)

[FeodorFitsner]

Are there any errors on Network/Console tab of your browser. I bet there is CORS error blocking direct requests to GitHub content from 3rd-party sites.

[m8factorial]

Sure! Thank you! I did not noticed it!