class Typhoeus::Request

def params_string
  params.keys.sort.collect do |k|
    value = params[k]
    if value.is_a? Hash
      value.keys.collect {|sk| Rack::Utils.escape("#{k}[#{sk}]") + "=" + Rack::Utils.escape(value[sk].to_s)}
    elsif value.is_a? Array
      key = Rack::Utils.escape(k.to_s)
      value.collect { |v| "#{key}=#{Rack::Utils.escape(v.to_s)}" }.join('&')
    else
      "#{Rack::Utils.escape(k.to_s)}=#{Rack::Utils.escape(params[k].to_s)}"
    end
  end.flatten.join("&")
end