How do I configure SNAT on IPTables

Goal (for if you have a better solution than my idea): Securely host a purely golang backend webapp on a domain that people don’t have to type “:port number” to access.

My current situation: I am learning golang, and want to create a golang http-server.

(Yes, I know about nginx & reverse-proxy)

Right now, my golang’s web servers are serving on nonprivileged ports, e.g. 8080, instead of port: 80. (I’d like not to run the golang http server as root to run on a privileged port, but that’s just me)

I was wanting my golang http server to serve to port 8080 , and have the IPTables monitor port 80 and redirect port 80 requests to my golang server @ 8080 via SNAT.

Hopefully I’m making myself clear.

I’ve read some documentation on it, but I’m better at learning by example.

Also, with everything on one droplet, I don’t need the entire address SNAT’d, just the ports.

Relevant environment info: Ubuntu 14.04 x64 golang 1.2.2

putty as my ssh client

limited ubuntu xp