404 on service with jupyterhub 4.1

[manics]

You could try the XSRF suggestions in

Auth redirects for service when making request from JS

If you want to allow cross-service requests to be authenticated with cookies, you’ll need to modify or disable the XSRF check. There are two ways: set disable_check_xsrf=True in the tornado settings of your application. This will allow cross-site requests to your service (probably fine for announcements, but consider what’s in them) define check_xsrf_cookie in your Handler class, to rely on another check that accepts requests from your whole site: class MyHandler(HubOAuthenticated, web.Reques…