Thanks Sara. I am betting that just changing the IP address will fix the problem. I was not aware it had changed. I will change that in the README.md and submit a pull request.
After I discovered the modular library, I had intended to use that for real deployments, but wanted a simple working example to show folks at work first. I will gladly contribute when I can.
Knowing how to make the post request by hand will be handy for debugging.
Thanks again for you help.