Locally 5000 port on, public port off, proxy server bypass the port, cloudflare free origin certficate, cloudlare full strict mode with dns proxy enabled

bazaarbound.com.conf

server {
    listen 443 ssl http2;
    listen [::]:443 ssl http2;
    server_name bazaarbound.com www.bazaarbound.com;

    ssl_certificate     /etc/ssl/cloudflare/cert.pem;
    ssl_certificate_key /etc/ssl/cloudflare/key.pem;

    root /var/www/html/bazaarbound-frontend/dist;
    index index.php index.html index.htm index.nginx-debian.html;

    location / {
        try_files $uri $uri/ /index.html;
    }

    # Backend API proxy (PM2 app running on port 5000)
    location /api/ {
        proxy_pass http://127.0.0.1:5000;
        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;
        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;
    }
}

Locally 5000 port on
public port off

proxy server bypass the port by nginx

cloudflare free SSL -> origin certficate issued by cert.pem and key.pem
cloudlare full strict mode of SSL
DNS A record proxy enabled