Bad Request 400 in Nginx When Running Django using Gunicorn

The "Bad Request 400" error in Nginx when running Django with Gunicorn usually indicates an issue with the HTTP request that Nginx is forwarding to Gunicorn. Here's a breakdown of common causes and how to troubleshoot them:

1. ALLOWED_HOSTS Setting in Django:

• Problem: Django's ALLOWED_HOSTS setting is a security measure that prevents requests with unknown host headers from being processed. If Nginx forwards a request with a host that's not listed in ALLOWED_HOSTS, Django will return a 400 error.

• Solution:

  • Open your Django project's settings.py file.
  • Add your domain name or IP address to the ALLOWED_HOSTS list. For example:
  Python

   

  ALLOWED_HOSTS = ['yourdomain.com', '127.0.0.1', 'localhost']
  

  • If you're unsure