    def init_proxy(self):
        """Load the Proxy config"""
        # FIXME: handle deprecated config here
        self.proxy = self.proxy_class(
            db_factory=lambda: self.db,
            public_url=self.bind_url,
            parent=self,
            app=self,
            log=self.log,
            hub=self.hub,
            host_routing=bool(self.subdomain_host),
            ssl_cert=self.ssl_cert,
            ssl_key=self.ssl_key,
        )
Load the Proxy config
jupyterhub/app.py