So for example, my Writefreely server runs on a computer `steve` in my basement.
My cheap ($10?/yr) dynamic dns provider maps `https://awadwatt.com/` to the IP address assigned by my ISP. I've configured my cable router firewall to allow inbound http ports to another computer `bob`. NGINX on `bob` gets the request for `awadwatt.com` and knows to redirect to `steve:80`, i.e. Writefreely runs on port 80 there.
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