Demonstration of Unix socket connector error before/after change to aiohttp

client output (after the changes)

(venv) zeal@zealx1 ~ $ python client.py
Traceback (most recent call last):
  File "/home/zeal/dev/aiohttp/venv/lib/python3.8/site-packages/aiohttp-4.0.0a1-py3.8-linux-x86_64.egg/aiohttp/connector.py", line 1113, in _create_connection
    _, proto = await self._loop.create_unix_connection(
  File "/usr/lib/python3.8/asyncio/unix_events.py", line 244, in create_unix_connection
    await self.sock_connect(sock, path)
  File "/usr/lib/python3.8/asyncio/selector_events.py", line 494, in sock_connect
    return await fut
  File "/usr/lib/python3.8/asyncio/selector_events.py", line 499, in _sock_connect
    sock.connect(address)
ConnectionRefusedError: [Errno 111] Connection refused

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "client.py", line 15, in <module>
    asyncio.get_event_loop().run_until_complete(main())
  File "/usr/lib/python3.8/asyncio/base_events.py", line 616, in run_until_complete
    return future.result()
  File "client.py", line 9, in main
    r = await session.get('http://host/')
  File "/home/zeal/dev/aiohttp/venv/lib/python3.8/site-packages/aiohttp-4.0.0a1-py3.8-linux-x86_64.egg/aiohttp/client.py", line 446, in _request
    conn = await self._connector.connect(
  File "/home/zeal/dev/aiohttp/venv/lib/python3.8/site-packages/aiohttp-4.0.0a1-py3.8-linux-x86_64.egg/aiohttp/connector.py", line 507, in connect
    proto = await self._create_connection(req, traces, timeout)
  File "/home/zeal/dev/aiohttp/venv/lib/python3.8/site-packages/aiohttp-4.0.0a1-py3.8-linux-x86_64.egg/aiohttp/connector.py", line 1116, in _create_connection
    raise UnixClientConnectorError(self.path, req.connection_key, exc) from exc
aiohttp.client_exceptions.UnixClientConnectorError: Cannot connect to unix socket /tmp/server.sock ssl:default [Connection refused]

client output (before any changes)

(venv) zeal@zealx1 ~ $ python client.py
Traceback (most recent call last):
  File "/home/zeal/dev/aiohttp/venv/lib/python3.8/site-packages/aiohttp-4.0.0a1-py3.8-linux-x86_64.egg/aiohttp/connector.py", line 1112, in _create_connection
    _, proto = await self._loop.create_unix_connection(
  File "/usr/lib/python3.8/asyncio/unix_events.py", line 244, in create_unix_connection
    await self.sock_connect(sock, path)
  File "/usr/lib/python3.8/asyncio/selector_events.py", line 494, in sock_connect
    return await fut
  File "/usr/lib/python3.8/asyncio/selector_events.py", line 499, in _sock_connect
    sock.connect(address)
ConnectionRefusedError: [Errno 111] Connection refused

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "client.py", line 15, in <module>
    asyncio.get_event_loop().run_until_complete(main())
  File "/usr/lib/python3.8/asyncio/base_events.py", line 616, in run_until_complete
    return future.result()
  File "client.py", line 9, in main
    r = await session.get('http://host/')
  File "/home/zeal/dev/aiohttp/venv/lib/python3.8/site-packages/aiohttp-4.0.0a1-py3.8-linux-x86_64.egg/aiohttp/client.py", line 446, in _request
    conn = await self._connector.connect(
  File "/home/zeal/dev/aiohttp/venv/lib/python3.8/site-packages/aiohttp-4.0.0a1-py3.8-linux-x86_64.egg/aiohttp/connector.py", line 506, in connect
    proto = await self._create_connection(req, traces, timeout)
  File "/home/zeal/dev/aiohttp/venv/lib/python3.8/site-packages/aiohttp-4.0.0a1-py3.8-linux-x86_64.egg/aiohttp/connector.py", line 1115, in _create_connection
    raise ClientConnectorError(req.connection_key, exc) from exc
aiohttp.client_exceptions.ClientConnectorError: Cannot connect to host host:80 ssl:default [Connection refused]

client.py

import aiohttp
import asyncio


async def main():
    async with aiohttp.ClientSession(
        connector=aiohttp.UnixConnector(path='/tmp/server.sock'),
    ) as session:
        r = await session.get('http://host/')
        print("Status:", r.status)
        print("Text:")
        print((await r.text()).strip())


asyncio.get_event_loop().run_until_complete(main())