ASGI lifespan state

[GuillaumeDesforges]

Please describe your feature request:

Support ASGI's lifespan state: https://asgi.readthedocs.io/en/latest/specs/lifespan.html

Scope

...
state Optional(dict[Unicode string, Any]) – An empty namespace where the application can persist state to be used when handling subsequent requests. Optional; if missing the server does not support this feature.

Describe the use case of this feature:

Lifespan state allows to share state between requests, such as a ML model in GPU or a connection to a database.

It is supported by other important ASGI servers such as uvicorn (ref: encode/uvicorn#1818)

However httpx is the recommended library to test FastAPI apps (AsyncClient) so we can't test such applications.

[AaronChen0]

This is a Go repository. What you want to request is this one, https://github.com/encode/httpx/ .

[GuillaumeDesforges]

Oops. My bad! Sorry about that.