Its possible to do this on the server side. Form submissions don’t require JavaScript, and authentication post submission can be done with cookies. Or if you want to go way back http basic auth.

To be clear: I support JavaScript on the web, just hoping to answer your question.

Also sorry: I answered the wrong question. Http basic with would still work.

I remember a time when basic auth gave you a unique url and the referrer was used to validate you. This was easy to break because you can fake the referrer.