This is continuation of the discussion from #286 (comment)

Hello! I experience an issue when running Litestar with Granian that I do not have when use Uvicorn. In the previous discussion I don't think I've provided a sufficient illustration.

Here’s a new one:

import asyncio
import math
import typing

import litestar
from litestar.response import ServerSentEvent


async def iter_sse_data() -> typing.AsyncIterable[str]:
    yield "hi"
    try:
        print("about to sleep indefinitely")
        await asyncio.sleep(math.inf)
    finally:
        print("cleaned up")


@litestar.get("/")
async def root() -> ServerSentEvent:
    return ServerSentEvent(iter_sse_data())


app = litestar.Litestar([root])

1. Run the app with Granian.
2. Run curl http://localhost:8000/, wait for data: hi and press Ctrl+C.
3. See that logs do not contain cleaned up.

Run the app with Uvicorn—and you’ll see that cleaned up was printed.