WebSocket wss:// на SSL с Nginx Gunicorn Daphne Channels Redis

Я пытаюсь запустить свой проект Django с WebSockets; в консоли браузера я получаю ошибку

WebSocket connection to 'wss://www.xxx.com:8001/ws/asdf/1234/' failed:

settings.py:

CHANNEL_LAYERS = {
        "default": {
            "BACKEND": "channels_redis.core.RedisChannelLayer",
            "CONFIG": {
                "hosts": [("config('REDIS_SERVER_NAME')", 6379)],
            },
            "ROUTING": "myproject.routing.channel_routing",
        },
    }

asgi.py:

os.environ.setdefault('DJANGO_SETTINGS_MODULE', 'myproject.settings')
django.setup()
application = get_default_application()

конфигурацияnginx:

server{
        server_name <IP-adress> <xxx.xxx>;

        location = /favicon.ico { access_log off; log_not_found off; }
        location / {
                include proxy_params;
                proxy_pass http://unix:/home/ubuntu/myproject/myproject.sock;
        }
        location /ws/ {
                proxy_http_version 1.1;
                proxy_set_header Upgrade $http_upgrade;
                proxy_set_header Connection "upgrade";
                proxy_redirect off;
                proxy_pass http://127.0.0.1:8001/;
        }

    listen [::]:443 ssl ipv6only=on; # managed by Certbot
    listen 443 ssl; # managed by Certbot
    ssl_certificate /etc/letsencrypt/live/xxx.xxx/fullchain.pem; # managed by Certbot
    ssl_certificate_key /etc/letsencrypt/live/xxx.xxx/privkey.pem; # managed by Certbot
    include /etc/letsencrypt/options-ssl-nginx.conf; # managed by Certbot
    ssl_dhparam /etc/letsencrypt/ssl-dhparams.pem; # managed by Certbot

}

daphne.service:

Unit]
Description=WebSocket Daphne Service
After=network.target

[Service]
Type=simple
User=root
WorkingDirectory=/home/ubuntu/myproject
ExecStart=daphne -e ssl:8001:privateKey=/etc/letsencrypt/live/xxx.xxx/privkey.pem:certKey=/etc/letsencrypt/live/xxx.xxx/fullchain.pem myproject.asgi:application
Restart=on-failure

[Install]
WantedBy=multi-user.target

Сайт работает нормально, и ws:// работал, когда я тестировал его без SSL сертификатов от certbot для доменов. Любая помощь будет оценена по достоинству...

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