docstr: Tries to resolve the app url from the provided `app_id_or_name_or_url`.
docstr_tok: ["Tries","to","resolve","the","app","url","from","the","provided","`","app_id_or_name_or_url","`","."]
code: def _maybe_find_url(self):
      """Tries to resolve the app url from the provided `app_id_or_name_or_url`."""
      if _is_url(self.app_id_or_name_or_url):
          self.url = self.app_id_or_name_or_url
          assert self.url
          return
  
      if self.app_id_or_name_or_url is None:
          url = f"http://localhost:{APP_SERVER_PORT}"
          resp = requests.get(f"{self.url}/openapi.json")
          if resp.status_code == 200:
              self.url = url
              return
  
      app = self._maybe_find_matching_cloud_app()
      if app:
          self.url = app.status.url
  
imports: import contextlib
  import functools
  import json
  import os
  import re
  import subprocess
  import sys
  from typing import Dict, Optional
  import arrow
  import click
  import packaging
  import requests
  import rich
  from lightning_cloud.openapi import Externalv1LightningappInstance
  from lightning.app import __package_name__, __version__
  from lightning.app.core.constants import APP_SERVER_PORT
  from lightning.app.utilities.app_helpers import Logger
  from lightning.app.utilities.cloud import _get_project
  from lightning.app.utilities.network import LightningClient
label_desc: Use image node_id 3 for calling the _LightningAppOpenAPIRetriever obj's underlying member method code with example usage: obj._maybe_find_url() without return types