Non working savon SOAP request without WSDL

savon no wsdl test

require 'rubygems'
require 'savon'

Savon.configure do |config|
  config.log_level = :debug
end


client = Savon::Client.new do
  wsdl.endpoint = "http://www.webservicex.net/globalweather.asmx"
  wsdl.namespace = "http://www.webserviceX.NET"
end

client.get_cities_by_country!  do |soap|            
  soap.action="GetCitiesByCountry"
  soap.namespace="http://www.webserviceX.NET"
  soap.input="GetCitiesByCountryRequest"
  soap.body = {
    :Country_name => "United States"
  }

end

This just returns:
ruby test_soap_nowsdl.rb
~/.rvm/gems/ruby-1.8.7-p334@savontest/gems/savon-0.8.6/lib/savon/client.rb:153:in send': undefined methodget_cities_by_country!' for main:Object (NoMethodError)
~/.rvm/gems/ruby-1.8.7-p334@savontest/gems/savon-0.8.6/lib/savon/client.rb:153:in `method_missing'
from test_soap_nowsdl.rb:14

was following this doc: https://github.com/rubiii/savon/wiki/wsdl

the documentation for savon >= v.0.8 can be found at: http://rubiii.github.com/savon