docs: def thread_exists(self, thread_id):
          """Check if a thread exists or has 404'd.
  
          Args:
              thread_id (int): Thread ID
  
          Returns:
              bool: Whether the given thread exists on this board.
          """
          return self._requests_session.head(
              self._url.thread_api_url(
                  thread_id=thread_id
                  )
          ).ok