DEPRECATED: c.JupyterHub.extra_handlers - how to switch to services?

JupyterHub Zero to JupyterHub on Kubernetes
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3

I encounter the same problem.
I have already made a service using RequestHandler with success.

But I need another service which display a template, so I want to use the BaseHandler which contains the render_template method.
In this case, I can’t get my service to run.

KeyError: 'hub'
Uncaught exception
Traceback (most recent call last):
  File "/usr/local/lib/python3.10/dist-packages/tornado/http1connection.py", line 276, in _read_message
    delegate.finish()
  File "/usr/local/lib/python3.10/dist-packages/tornado/routing.py", line 268, in finish
    self.delegate.finish()
  File "/usr/local/lib/python3.10/dist-packages/tornado/web.py", line 2378, in finish
    self.execute()
  File "/usr/local/lib/python3.10/dist-packages/tornado/web.py", line 2400, in execute
    self.handler = self.handler_class(
  File "/usr/local/lib/python3.10/dist-packages/tornado/web.py", line 231, in __init__
    self.clear()
  File "/usr/local/lib/python3.10/dist-packages/tornado/web.py", line 332, in clear
    self.set_default_headers()
  File "/usr/local/lib/python3.10/dist-packages/jupyterhub/handlers/base.py", line 229, in set_default_headers
    self.set_header('Content-Security-Policy', self.content_security_policy)
  File "/usr/local/lib/python3.10/dist-packages/jupyterhub/handlers/base.py", line 204, in content_security_policy
    ["frame-ancestors 'self'", "report-uri " + self.csp_report_uri]
  File "/usr/local/lib/python3.10/dist-packages/jupyterhub/handlers/base.py", line 194, in csp_report_uri
    'csp_report_uri', url_path_join(self.hub.base_url, 'security/csp-report')
  File "/usr/local/lib/python3.10/dist-packages/jupyterhub/handlers/base.py", line 154, in hub
    return self.settings['hub']
KeyError: 'hub'

Here the code:

class MyHandler(BaseHandler):

    async def get(self):
        html = await self.render_template("custom_template.html", args=[])
        self.finish(html)

def main():
    app = Application(
        [
            (os.environ['JUPYTERHUB_SERVICE_PREFIX'], MyHandler),
            (r'.*', MyHandler),
        ],
        cookie_secret=os.urandom(32),
    )

    http_server = HTTPServer(app)
    url = urlparse(os.environ['JUPYTERHUB_SERVICE_URL'])

    http_server.listen(url.port, url.hostname)

    IOLoop.current().start()


if __name__ == '__main__':
    main()

@Data_Mastery Did you managed to adapt your code to service ?