How to get Hubic Webdav credentials

hubic.rb

#!/usr/bin/env ruby
# hubic.rb Get credentials to Webdav server of Hubic account
require 'httpclient'
require 'json'
require 'optparse'
require 'highline/import'

module Hubic
  extend self
  
  attr_accessor :proxy
  
  BASE_URL = 'https://ws.ovh.com/cloudnas/r0/ws.dispatcher'
  URLS = { 
    :login        => BASE_URL + '/nasLogin', 
    :nas          => BASE_URL + '/getNas', 
    :credentials  => BASE_URL + '/getCredentials' }

  def credentials(login, pass, &block)
    result = {}
    client = HTTPClient.new
    client.proxy = proxy if proxy         
    client.agent_name = 'hubiC/1.0.9 (Windows NT 6.1; fr_FR)'
    response = client.post URLS[:login], 
      { :session => '', :params => { :email => login , :password => pass}.to_json }
    check_error response
    id = JSON.parse(response.body)['answer']['id']
    response = client.post URLS[:nas], { :session => id }
    check_error response
    result.merge! :url => JSON.parse(response.body)['answer']['url']
    response = client.post URLS[:credentials], { :session => id }
    check_error response
    result.merge! :username => JSON.parse(response.body)['answer']['username']
    result.merge! :secret   => JSON.parse(response.body)['answer']['secret']
    return block_given? ? yield(result) : result
  end
  
  private
  def check_error response
    case 
    when response.status_code != 200
      raise "Connexion failed -> " + response.reason_phrase
    when JSON.parse(response.body)['answer'].nil?
      raise "Connexion failed -> " + JSON.parse(response.body)['error']['message']       
    end
  end    
end

options = {}
OptionParser.new do |opts|
  opts.banner = "Usage: #{File.basename($0)} [-l login] [-m [mountpoint]]"
  opts.on("-l", "--login LOGINNAME", "Account's loginname (email)") do |l|
    options[:login] = l 
  end
  opts.on("-p", "--password PASSWORD", "Account's password") do |p|
    options[:paswd] = p 
  end
  opts.on("-x", "--proxy PROXYSERVER", "Routes through proxy") do |p|
    Hubic.proxy = p 
  end
  opts.on("-m", "--mount [MOUNTPOINT]", "Offers to mount the Webdav server", 
    "Available only on Unix") do |m|
    options[:mount] = true
    options[:mntpt] = m  
  end
  opts.on_tail("-h", "--help", "Show this message") do
    puts opts
    exit
  end
end.parse!

login    = options[:login] ? options[:login] : ask("Loginname: ") { |q| q.echo = true }
password = options[:paswd] ? options[:paswd] : ask('Password : ') { |q| q.echo = '*' }
Hubic.credentials(login, password) do |data|
  data.each { |key, value| puts key.to_s + ": " + value.to_s }
  if options[:mount]
    mountpoint = options[:mntpt] || '/mnt'
    case
    when RUBY_PLATFORM.match(/linux/i)
      `mount -t davfs #{data[:url]} #{mountpoint}`
    when RUBY_PLATFORM.match(/darwin|bsd/i)
      `mount_webdav -s #{data[:url]} #{mountpoint}`
    else
      raise "Don't know how to mount a Webdav volume on non-Unix plateforms"
    end
  end
end

Doesn't work:

hubic.rb:42:in `check_error': undefined method `reason_phrase' for #<HTTP::Message:0x007ff4b3290b58> (NoMethodError)
    from hubic.rb:26:in `credentials'
    from hubic.rb:74:in `<main>'