nginx.conf

worker_processes 1;

events {
    worker_connections 1024;
    multi_accept on;
}

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

    upstream app {
        server 127.0.0.1:35000;
    }

    server {
        listen 30080;
        listen [::]:30080;
        location / {
            proxy_set_header Host $http_host;
            proxy_set_header X-Real-IP $remote_addr;
            proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
            proxy_set_header X-Forwarded-Proto $scheme;

            proxy_pass http://app;
        }
        location /socket.io {
            proxy_set_header Host $http_host;
            proxy_set_header X-Real-IP $remote_addr;
            proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
            proxy_set_header X-Forwarded-Proto $scheme;

            proxy_http_version 1.1;
            proxy_buffering off;
            proxy_set_header Upgrade $http_upgrade;
            proxy_set_header Connection "Upgrade";
            proxy_redirect off;

            proxy_pass http://app/socket.io;
        }
        location /favicon.ico {
            proxy_pass http://app/assets/favicon.ico;
        }
        access_log /dev/stdout;
        error_log /dev/stderr;
    }
}