reverse SSH tunnel any rack app with pow and nginx

Here is a good tutorial show you about reverse SSH tunnel any rack app with pow and nginx:

Often times it’s useful to be able to access your local working copy of a Rails/Rack app from somewhere else on the internet. One common situation is wanting to demo some new work you’re hacking on to a client or another developer without having to put it into the SCM and deploy it; another we’ve run into is some external services which initiate callbacks to the app need a publicly-accessible hostname and will sometimes only work on port 80. This can be tricky to get working behind NAT, with a frequently changing IP, or with an ISP that blocks inbound port 80 connections