How can I get the final URL after redirects using Ruby?

Question

If http://foo.com redirects to 1.2.3.4 which then redirects to http://finalurl.com, how can I use Ruby to find out the landing URL \"h

Answer 1

for JRuby this worked

def get_final_url (url)
    final_url = ""
    until url.nil? do
      final_url = url
      url = Net::HTTP.get_response(URI.parse(url))['location']
    end

    final_url
  end