The first stage will only be used to **install Poetry** and to **generate the `requirements.txt`** with your project dependencies from Poetry's `pyproject.toml` file.

This `requirements.txt` file will be used with `pip` later in the **next stage**.

    In particular, when running on **Kubernetes** you will probably **not** want to use Gunicorn and instead run **a single Uvicorn process per container**, but I'll tell you about it later in that chapter.

## Gunicorn with Uvicorn Workers

sponsors:
- - login: bump-sh
    avatarUrl: https://avatars.githubusercontent.com/u/33217836?v=4
    url: https://github.com/bump-sh
  - login: porter-dev
    avatarUrl: https://avatars.githubusercontent.com/u/62078005?v=4
    url: https://github.com/porter-dev
  - login: andrew-propelauth
    avatarUrl: https://avatars.githubusercontent.com/u/89474256?u=1188c27cb744bbec36447a2cfd4453126b2ddb5c&v=4
    url: https://github.com/andrew-propelauth

This new `examples` field in JSON Schema is **just a `list`** of examples, not a dict with extra metadata as in the other places in OpenAPI (described above).

!!! info

) -> Callable[[WebSocket], Coroutine[Any, Any, Any]]:
    async def app(websocket: WebSocket) -> None:
        async with AsyncExitStack() as async_exit_stack:
            # TODO: remove this scope later, after a few releases
            # This scope fastapi_astack is no longer used by FastAPI, kept for
            # compatibility, just in case
            websocket.scope["fastapi_astack"] = async_exit_stack