websocket nginx

map $http_upgrade $connection_upgrade {
        default upgrade;
        '' close;
}

upstream websocket {
    server host.docker.internal:8080;
}

server {
    listen 8020;
    location / {
        proxy_pass http://websocket;
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection $connection_upgrade;
        proxy_set_header Host $host;
    }
}