serve on both 127.0.0.1 and public port

[switham]

Any time we want to serve on a public port, we want to also still serve on 127.0.0.1 for the local user. But, how does, e.g., wsgi_rev.simplexxx serve on two ports at once? It would be possible to run two processes or threads each with a wsgi server, but then they need to coordinate with each other.

Sigh, this would also get into a situation with sessions [https://github.com//issues/14], since there could be multiple users.