Add allow_insecure_kernelspec_params to page config

Author: AnastasiaSliusar

jupyterlab_server/handlers.py

@@ -82,6 +82,8 @@ def get_page_config(self) -> dict[str, Any]:
         server_root = self.settings.get("server_root_dir", "")
         server_root = server_root.replace(os.sep, "/")
         base_url = self.settings.get("base_url")
+        server_app = self.settings.get("serverapp")
+        allow_insecure_kernelspec_params = server_app.allow_insecure_kernelspec_params
 
         # Remove the trailing slash for compatibility with html-webpack-plugin.
         full_static_url = self.static_url_prefix.rstrip("/")
@@ -91,6 +93,7 @@ def get_page_config(self) -> dict[str, Any]:
         page_config.setdefault("ignorePlugins", [])
         page_config.setdefault("serverRoot", server_root)
         page_config["store_id"] = self.application.store_id  # type:ignore[attr-defined]
+        page_config.setdefault("allow_insecure_kernelspec_params", allow_insecure_kernelspec_params)
 
         server_root = os.path.normpath(os.path.expanduser(server_root))
         preferred_path = ""