server {
    listen 443 ssl http2;
    server_name upload.app.io;
    underscores_in_headers on;

    location / {
        client_max_body_size 0;

        proxy_request_buffering off;
        proxy_pass http://localhost:3000;
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection 'upgrade';
        proxy_set_header Host $host;
        proxy_cache_bypass $http_upgrade;
    }

    ssl_certificate /etc/nginx/ssl/ca-bundle.crt;
    ssl_certificate_key /etc/nginx/ssl/server.key;
}