Can I just use Heroku or Vercel?

Yes. Platform-as-a-Service (PaaS) providers like Heroku, Render, or Railway abstract away Nginx and Gunicorn configuration. They are excellent for fast deployments. However, understanding the underlying Nginx/Gunicorn stack is mandatory if you ever migrate to raw AWS EC2 or DigitalOcean Droplets to save money.

What is an ASGI Server?

WSGI (Gunicorn) is synchronous—it handles one request per worker at a time. ASGI (Uvicorn) is asynchronous. If you are building a real-time chat application using Django Channels (WebSockets), you MUST deploy using an ASGI server to handle thousands of concurrent, long-lived connections.

Why do I get 'Bad Request (400)' when DEBUG=False?

When `DEBUG = False`, Django enforces a strict security check. It will instantly crash any incoming request if the domain name doesn't match the `ALLOWED_HOSTS` list in your settings. You must explicitly add your production domain: `ALLOWED_HOSTS = ['www.myapp.com']`.

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Master Django Deployment. Learn the critical security difference between DEBUG modes, how to protect secrets with Environment Variables, and architect an industrial-grade server using Gunicorn and Nginx.

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