net_http.rb

require 'net/http'

def download_net_http(urls, thread_count)
  queue = Queue.new
  urls.map { |url| queue << url }

  threads = thread_count.times.map do
    Thread.new do
      Net::HTTP.start('our-s3-bucket.s3.amazonaws.com', 80) do |http|
        while !queue.empty? && url = queue.pop
          uri = URI(url)
          request = Net::HTTP::Get.new(uri)
          response = http.request request
          write_file url, response.body
        end
      end
    end
  end

  threads.each(&:join)
end