How to find the local port a rails instance is running on?

Question

So I would like my Rails app instances to register themselves on a "I'm up" kind of thing I'm playing with, and I'd like it to be able to mention what local port it's running on. I can't seem to find how to do it - in fact just finding out its IP is tricky and needs a bit of a hack.

But no problem, I have the IP - but how can I find what port my mongrel/thin/webrick server is running on?

To be super explicit, if I start a rails app using script/server -p 3001, what can I do to pull that 3001 inside the app.

Thanks.

Answer 1

From inside any controller action, check the content of request.port, thus:

class SomeController < ApplicationController
  def some_action
    raise "I'm running on port #{request.port}."
  end
end