# File lib/fog/key_manager/openstack.rb, line 120
        def supported_version(supported_versions, uri, auth_token, connection_options = {})
          connection = Fog::Core::Connection.new("#{uri.scheme}://#{uri.host}:#{uri.port}", false, connection_options)
          response = connection.request({ :expects => [200, 204, 300],
                                          :headers => {'Content-Type' => 'application/json',
                                                       'Accept' => 'application/json',
                                                       'X-Auth-Token' => auth_token},
                                          :method => 'GET'
                                        })

          body = Fog::JSON.decode(response.body)
          version = nil

          versions =  body.fetch('versions',{}).fetch('values',[])
          versions.each do |v|
            if v.fetch('id', "").match(supported_versions) &&
              ['current', 'supported', 'stable'].include?(v.fetch('status','').downcase)
              version = v['id']
            end
          end

          if !version  || version.empty?
            raise Fog::OpenStack::Errors::ServiceUnavailable.new(
                    "OpenStack service only supports API versions #{supported_versions.inspect}")
          end

          version
        end