Unnecessary access log when socket disconnects before sending any bytes

Describe the bug A socket connection request to server will cause following error:

[2021-08-30 10:29:31 +0800] - (sanic.access)[INFO][UNKNOWN]: NONE http:///*  503 666
[2021-08-30 10:29:31 +0800] [6386] [ERROR] Connection lost before response written @ ('127.0.0.1', 36214) <Request: NONE *>

why and how can i prevent that?

Code snippet server.py

from sanic import Sanic
from sanic import text

app = Sanic.get_app("test", force_create=True)

@app.get("/")
async def response(request):
    return text("ok")

if __name__ == "__main__":
    app.run(host="0.0.0.0", port=9000, access_log=True, debug=True)

client.py

import socket

if __name__ == '__main__':

    server_addr = ('localhost', 9000)

    tcp_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    tcp_socket.connect(server_addr)
    tcp_socket.close()

Expected behavior no error msg

Environment (please complete the following information):

• OS: CentOS
• Version: 21.6.2

[Frankr0]

Was this fixed? Couldn’t reproduce, or I miss something?

I just tested it on version 21.12 and it seems to get fixed.

[ahopkins]

I disagree. A connection is opened, it should be logged. The level at which that happens I do not disagree is probably not an ERROR. But it shouldn’t be quiet either. If for no other reason, it would be very hard to impossible to track what was happening if you had some rogue agent opening and closing connections in rapid succession.