configure WEBrick on port 80 — RubyOnRails

This is a simple configuration of port 80 WEBrick, Server by default in RubyOnRails.
A few minutes ago I was looking to change the parameters for lifting him webrick in port 80, because the truth is that he did not want in 3000 perhaps for the sake of himself …. I leave here the way they can do,

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