code: def external_url(self, service, path, base_scheme="http"):
      if self._base_path is None:
          if service == "www":
              return f"{base_scheme}s://{self._domain}{path}"
          return f"{base_scheme}s://{service}.{self._domain}{path}"
      return f"{base_scheme}s://{self._domain}{self._base_path}/{service}{path}"
  
imports: from typing import Dict, Optional, TypeVar, Union
  import os
  import json
  import logging
  from ..utils import first_extant_file
  from .user_config import get_user_config
label_desc: Use image node_id 15 for calling the DeployConfig obj's underlying member method code with example usage: obj.external_url(service, path, base_scheme) and returns: base_scheme, str, self, self, str, service, path, base_scheme, str, service, str, self, path, base_scheme, str, self, path