code: def _ensure_started(self):
          
          if not self.started:
              async_handlers = [startup_handler for startup_handler in self.startup_handlers if
                                introspect.is_coroutine(startup_handler)]
              if async_handlers:
                  loop = asyncio.get_event_loop()
                  loop.run_until_complete(asyncio.gather(*[handler(self) for handler in async_handlers], loop=loop))
              for startup_handler in self.startup_handlers:
                  if not startup_handler in async_handlers:
                      startup_handler(self)
docs: Marks the API as started and runs all startup handlers