How to deploy aiohttp chat (Nginx+Supervisord)?

Question

Python

Hey!
There is an Ubuntu 16.04.1 LTS server (GNU/Linux 4.4.0-53-generic x86_64)
I decided to deploy aiohttp following the documentation example. Only in a more simplified form.
My nginx config:

upstream aiohttp_chat {
    server 127.0.0.1:8080;
}

server {

    listen 80;
    server_name example.com;

    error_log /var/log/nginx/error.log;

    location / {

        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header Host $host;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_redirect off;
        proxy_pass http://aiohttp_chat;

        proxy_read_timeout 200;
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection "upgrade";
    }
}

Supervisor config:

[program:chat]
command=/home/ubuntu/www/venv/bin/python /home/ubuntu/www/aiohttp-chat/app.py
directory=/home/ubuntu/www/aiohttp-chat
user=nobody
autostart=true
autorestart=true
stderr_logfile=/var/log/supervisor/chat.err.log
stdout_logfile=/var/log/supervisor/chat.out.log

aiohttp router:

router = app.router
router.add_route('GET', '/chat/{channel}/{token}/', handlers.websocket_handler)

I run:

loop = asyncio.get_event_loop()
app = loop.run_until_complete(get_app())
web.run_app(app)

When trying to connect (ws://example.com/chat/1/dsfbgrgbre432t325q/) via any online websocket client or chrome extension, I get an undefined error.
It is not clear what exactly does not work - nginx error.log is empty, access.log shows that someone is trying to reach out, but attempts end in 404.
Supervisord is working properly - status RUNNING.
Do I need to write the regex of my router in Nginx in the location block?
Tell me, what is my problem?

Answer 1

The problem was solved by opening port 8080.

Answer 2

ws://example.com/chat/1/dsfbgrgbre432t325q/
why on example.com?