Attach Net:HTTP requests to multiple local IPs

multi.rb

require 'net/http'

ips = `ifconfig | awk '/inet addr:[0-9]/{print $2;}' | grep -oE '([0-9.]{7,})'`.
  split("\n").
  select { |ip| ip.match(/\./) && !ip.match(/^127/) }

def attach_to(ip)
  TCPSocket.instance_eval do
    (class << self; self; end).instance_eval do
      alias_method :original_open, :open

      define_method(:open) do |conn_address, conn_port|
        original_open(conn_address, conn_port, ip)
      end
    end
  end

  yield

  TCPSocket.instance_eval do
    (class << self; self; end).instance_eval do
      alias_method :open, :original_open
      remove_method :original_open
    end
  end
end

ips.each do |ip|
  attach_to(ip) do
    url = URI.parse('http://www.whatismyip.com')
    begin
      res = Net::HTTP.start(url.host, url.port) do |http|
        http.get('/automation/n09230945.asp')
      end
      puts "#{ip} got response: #{res.body}"
    rescue Exception => e
      puts "#{ip} raised: #{e.message}"
    end
  end
end

https://github.com/hakanensari/net-http-local