How do Django, Nginx, and Gunicorn interact when deploying web applications?

Django is a web framework in Python that handles application logic and generates HTTP responses. Gunicorn is a WSGI server that runs the Django application and accepts requests from the web server. Nginx is a reverse proxy server that accepts HTTP requests from clients (browsers) and forwards them to Gunicorn.

Interaction scheme:

1. The client sends an HTTP request to Nginx.
2. Nginx handles static files (css, js, images) directly, which is faster.
3. If the request requires Django processing, Nginx proxies the request to Gunicorn.
4. Gunicorn passes the request to the Django application via the WSGI interface.
5. Django processes the request, generates a response, and returns it to Gunicorn.
6. Gunicorn sends the response back to Nginx.
7. Nginx sends the response to the client.

This separation allows for efficient request processing, offloading static content handling from Django, and ensuring scalability and stability.