Access logs looks duplicated

[g0di]

When running an application, it looks like access logs are always duplicated. The first access log on request is fine and show all required information. Then there is a completely identical log right after with only a small difference, it does not have any status code nor size (got - instead).

Note that I tried to change settings, log configuration and so on without any success

$ hypercorn --access-log '-' main:app
[2023-11-21 10:17:51 +0100] [15956] [WARNING] ASGI Framework Lifespan error, continuing without 
Lifespan support
[2023-11-21 10:17:51 +0100] [15956] [INFO] Running on http://127.0.0.1:8000 (CTRL + C to quit)
[2023-11-21 10:17:54 +0100] [15956] [INFO] 127.0.0.1:64983 - - [21/Nov/2023:10:17:54 +0100] "GET / 1.1" 200 5 "-" "curl/7.80.0"
[2023-11-21 10:17:54 +0100] [15956] [INFO] 127.0.0.1:64983 - - [21/Nov/2023:10:17:54 +0100] "GET / 1.1" - - "-" "curl/7.80.0"

Python 3.10 Microsoft Windows 10 Enterprise (and gitbash) Hypercorn 0.15.0

Expected behavior

I would personally expect to have a single access log per request. However, maybe I'm wrong and I missed the point of that second log message. In the latter, is there a way to disable it?

How to reproduce

1. Install fastapi and hypercorn

python -m venv .venv
source .venv/bin/activate
pip install 'hypercorn==0.15.0'

2. Create small api (using the one given in tutorial)

sync def app(scope, receive, send):
    if scope["type"] != "http":
        raise Exception("Only the HTTP protocol is supported")
    await send(
        {
            "type": "http.response.start",
            "status": 200,
            "headers": [
                (b"content-type", b"text/plain"),
                (b"content-length", b"5"),
            ],
        }
    )
    await send(
        {
            "type": "http.response.body",
            "body": b"hello",
        }
    )

3. Run a request

curl http://localhost:8000

Cheers!