login_rate_limit_test.rb

#!/usr/bin/env ruby

require 'httparty'

url = ''
concurrency = 15

threads = []
concurrency.times do |i|
  threads << Thread.new do
    options = {
      body: {
        user: { # your resource
          email: '',
          password: '',
        },
        commit: 'Sign in',
      }
    }

    response = HTTParty.post(url, options)

    p "Request #{i}: #{response.code}"
  end
end

threads.each(&:join)