docs: async def get_target(config, url):
      """ Given a URL, get the webmention endpoint """
  
      previous = config.cache.get(
          'target', url, schema_version=SCHEMA_VERSION) if config.cache else None
  
      headers = previous.caching if previous else None
  
      request = await utils.retry_get(config, url, headers=headers)
      if not request or not request.success:
          return previous
  
      if request.cached:
          return previous
  
      current = Target(request)
  
      if config.cache:
          config.cache.set('target', url, current)
  
      return current