UNIX domain socket raises 503 when workers are used

[ivankravets]

Is it Ok when a combination of --workers and --uds raises 503 error via nginx? For example:

--workers 4 --uds /var/run/uvicorn-test.sock

it works well when --workers is omitted (1 worker). Please note that gunicorn works well via Unix socket and multiple workers.

Thanks!

[Hanaasagi]

It seems that when combine the --workers and --uds arguments. uvicorn will ignore --uds and create a tcp socket.

uvicorn/uvicorn/main.py

Lines 274 to 277 in e0a77de

	elif config.workers > 1:
	sock = config.bind_socket()
	supervisor = Multiprocess(config)
	supervisor.run(server.run, sockets=[sock])

uvicorn/uvicorn/config.py

Lines 220 to 228 in e0a77de

	def bind_socket(self):
	sock = socket.socket()
	sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
	sock.bind((self.host, self.port))
	sock.set_inheritable(True)
	message = "Uvicorn running on %s://%s:%d (Press CTRL+C to quit)"
	protocol_name = "https" if self.is_ssl else "http"
	self.logger_instance.info(message % (protocol_name, self.host, self.port))
	return sock