Connect to openvstack keystone v3 and make a request using basic faraday.

faraday_openstack_test.rb

#!/usr/bin/ruby
require 'faraday'
require 'json'

conn = Faraday.new(:url => 'http://localhost:5000')

responce = conn.post do |post|
  post.url '/v3/auth/tokens'
  post.headers['Content-Type'] = 'application/json'
  post.body = {
    :auth => {
      :scope => {
        :project => {
          :domain => { :name => 'service_domain' },
          :name => 'servicesv3'
        }
      },
      :identity => {
        :methods  => [:password],
        :password => {
          :user => {
            :name => 'beaker-civ3',
            :domain => {
              :name => 'service_domain'
            },
            :project => 'servicesv3',
            :password => 'secret'
          }
        }
      },
    }
  }.to_json
end

token = responce.headers['x-subject-token']

3.times.each do
  responce_1 = conn.get do |get|
    get.url '/v3/services'
    get.headers['Content-Type'] = 'application/json'
    get.headers['X-Auth-Token'] = token
  end
  puts JSON.parse(responce_1.body)
end