code: def get_server_url():
      with open(CONFIG_PATH, "r") as fp:
          server_url = json.load(fp)["server_url"]
      return server_url
  
file_path: VisualDL/visualdl/server/serve.py
imports: import requests
  import json
  import os
  from visualdl.io import bfile
  from visualdl.reader.reader import is_VDLRecord_file
  from visualdl.utils.dir import CONFIG_PATH
  from visualdl.server.log import logger
label_desc: Use image node_id 1 for calling a global function with example usage: get_server_url() and returns: server_url