docs: def get_environments():
          """
          :return: all knows environments
          """
          LOGGER.debug("EnvironmentService.get_environments")
          args = {'http_operation': 'GET', 'operation_path': ''}
          response = EnvironmentService.requester.call(args)
          ret = None
          if response.rc == 0:
              ret = []
              for environment in response.response_content['environments']:
                  ret.append(Environment.json_2_environment(environment))
          elif response.rc != 404:
              err_msg = 'EnvironmentService.get_environments - Problem while getting environments. ' \
                        'Reason: ' + str(response.response_content) + '-' + str(response.error_message) + \
                        " (" + str(response.rc) + ")"
              LOGGER.warning(err_msg)
          return ret