self_request.rb

#!/usr/bin/env ruby

require 'rack'
require 'net/http'
require 'uri'

pid = fork do
  Rack::Handler::WEBrick.run ->(env){ [200, {'Content-Type' => 'plain/text'}, ['Nyan!']] }, Port: 9000
end

sleep 1

begin
  puts Net::HTTP.get(URI.parse('http://localhost:9000/'))
ensure
  Process.kill 'KILL', pid
end