Nginx to proxy Websocket and GRPC traffix on the same port

nginx.conf

events {
}

http {
    log_format  main  '$remote_addr - $remote_user [$time_local] "$request" '
                      '$status $body_bytes_sent "$http_referer" '
                      '"$http_user_agent"';

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

    server {
        listen 443 ssl http2;
    
        ssl_certificate     cert.pem;
        ssl_certificate_key key.pem;

        access_log /tmp/access.log main;
        error_log /tmp/error.log error;
 
        proxy_buffering off;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Scheme $scheme;
        proxy_set_header Host $http_host;

        location /proto.Centrifuge {
            grpc_pass grpc://localhost:8001;
        }

        location /connection/websocket {
            proxy_pass http://localhost:8000;
            proxy_http_version 1.1;
            proxy_set_header Upgrade $http_upgrade;
            proxy_set_header Connection $connection_upgrade;
        }
    }
}