code: def set_server_url(self, server_url):
      self._server_url = server_url.rstrip("/").strip()
  
imports: import cgi
  import http.client
  import json
  import logging
  import mimetypes
  import os
  import tempfile
  from urllib.parse import quote_plus, urlparse
  import requests
label_desc: Use image node_id 4 for calling the MONAILabelClient obj's underlying member method code with example usage: obj.set_server_url(server_url) without return types