code: def http_session(self):
      assert (
          self.http_server
      ), "Accessing unsupported API (HttpServerAgent) in a minimal ray."
      return self.http_server.http_session
  
imports: import argparse
  import asyncio
  import json
  import logging
  import logging.handlers
  import os
  import pathlib
  import sys
  import signal
  import ray
  import ray._private.ray_constants
  import ray._private.services
  import ray._private.utils
  import ray.dashboard.consts
  import ray.dashboard.utils
  from ray._private.process_watcher import create_check_raylet_task
  from ray._private.gcs_utils import GcsAioClient
  from ray._private.ray_logging import setup_component_logger, configure_log_file
  from ray._private.ray_constants import AGENT_GRPC_MAX_MESSAGE_LENGTH
label_desc: Use image node_id 4 for calling the DashboardAgent obj's underlying member method code with example usage: obj.http_session() and returns: self