I thought for sure this would be a normal thing, but while reading about Nitrous, Koding, Codio, etc, I couldn't quite find it.
I want to build a site in an online IDE and share a private url with people to use it. I don't want the public to see it, only those that I invite via email or authentication or ???
I thought Codio did it, but it says that no-one can see a private url. And everyone can see a public url. Not what I want.
You can set http basic auth on rails and django applications on Nitrous.
Here's a detailed article explaining how to set http basic auth on a Rails and Django application:
https://community.nitrous.io/docs/setting-up-basic-auth-on-nitrous-preview-urls
Example Rails controller code: