async_gem_demo.rb

require 'net/http'
require 'uri'
require 'async'
require 'benchmark'

bm = Benchmark.measure("Asynchronous flow") do
  Async do
    results = 21.times.map do |url|
      Async do
        Net::HTTP.get_response(URI("https://dog.ceo/api/breeds/image/random"),)
      end
    end

    results.each do |response|
      puts response.wait.body
    end
  end
end

puts bm