Color syntax didn't work in Jupyter notebook

[quentin9696]

OS/Web Information

• Web Browser: Firefox 88.0
• Local OS: Windows
• Remote OS: Ubuntu 20.04
• Remote Architecture: Jupyter + proxy server plugin
• code-server --version: 3.9.3

Steps to Reproduce

1. Install code server on a notebook (eg jupyter/datascience-notebook)

jupyter serverextension enable --sys-prefix jupyter_server_proxy
curl -sSLo /resources/code-server.deb \
  https://github.com/cdr/code-server/releases/download/v3.9.3/code-server_3.9.3_amd64.deb

apt-get update

apt install /resources/code-server.deb --yes

echo <<-EOF 
c.ServerProxy.servers = {
    'codeserver': {
        'command': ['code-server', '--auth', 'none', '--disable-telemetry', '--disable-update-check', '--bind-addr', '127.0.0.1:3080'],
        'port': 3080,
        'timeout': 120,
        'launcher_entry': {
            'enabled': True,
            'title': 'Code-Server',
        },
    },
}
EOF>> /etc/jupyter/jupyter_notebook_config.py

2. Run the docker using jupyter (not in standalone, but with Jupyter)

Expected

We should have the syntax coloration.

Actual

Don't have the syntax coloration.

Logs

In dev console, we got this error message

logger.ts:173 error [Service Worker] registration: Failed to register a ServiceWorker: The provided scope ('/codeserver/') or scriptURL ('/usr/lib/code-server/dist/serviceWorker.js') includes a disallowed escape character. 
TypeError: Failed to register a ServiceWorker: The provided scope ('/codeserver/') or scriptURL ('/usr/lib/code-server/dist/serviceWorker.js') includes a disallowed escape character.    
at /usr/lib/code-server/dist/register.js:14:1767    
at /usr/lib/code-server/dist/register.js:14:1301    
at Object.next (/usr/lib/code-server/dist/register.js:14:1406)    
at /usr/lib/code-server/dist/register.js:14:319    
at new Promise (<anonymous>)    
at e (usr/lib/code-server/dist/register.js:14:67)    
at n (/usr/lib/code-server/dist/register.js:14:1530)    
at Object.parcelRequire.O6cr.../common/util (/usr/lib/code-server/dist/register.js:14:2147)    
at f (/usr/lib/code-server/dist/register.js:1:468)    
at parcelRequire.i8TM (/usr/lib/code-server/dist/register.js:1:771)

Notes

Only when running code-server via jupyter. If I run the docker in standalone mode, it's ok

[jsjoeio]

Thanks for opening this issue and posting the logs. We'll investigate this.