code: def check_number_available(self, id_environment, num_vlan, id_vlan):
          
  
          url = 'vlan/check_number_available/' + \
              str(id_environment) + '/' + str(num_vlan) + '/' + str(id_vlan)
  
          code, xml = self.submit(None, 'GET', url)
  
          return self.response(code, xml)
docs: Checking if environment has a number vlan available
  
          :param id_environment: Identifier of environment
          :param num_vlan: Vlan number
          :param id_vlan: Vlan indentifier (False if inserting a vlan)
  
          :return: True is has number available, False if hasn't
  
          :raise AmbienteNaoExisteError: Ambiente não cadastrado.
          :raise InvalidParameterError: Invalid ID for VLAN.
          :raise VlanNaoExisteError: VLAN not found.
          :raise DataBaseError: Networkapi failed to access the database.
          :raise XMLError: Networkapi failed to generate the XML response.