check_loadbalancing.rb

# Sascha Spreitzer (c) 2018, MIT License

require 'net/http'
require 'thread'

url = ARGV[0] ||= 'http://example.com/'
many = ARGV[1] ||= 100
res = {}
m = Mutex.new
thr = []

start = Time.now

many.to_i.times do
  thr << Thread.new do
    h = Net::HTTP.get(URI(url))
    m.synchronize do
      t = res.member?(h)
      res[h] += 1 if t
      res[h]  = 1 unless t
    end
  end
end

thr.each { |th| th.join }

stop = Time.now

puts "#{res.size} different responses"
puts ""
res.each do |k, v|
  puts "#{k[0..10]}..: #{v}"
end
puts ""
puts "Time elapsed: #{(stop-start).round(2)}s"