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Python Django django.core.exceptions.DisallowedHost

The request's host header is not in the ALLOWED_HOSTS setting.

Understanding Django and Its Purpose

Django is a high-level Python web framework that encourages rapid development and clean, pragmatic design. It is designed to help developers take applications from concept to completion as quickly as possible. Django emphasizes reusability, less code, low coupling, rapid development, and the principle of 'don't repeat yourself'. It is widely used for building web applications due to its simplicity and flexibility.

Identifying the Symptom: DisallowedHost Error

When working with Django, you might encounter the django.core.exceptions.DisallowedHost error. This error typically manifests as a server error when you try to access your Django application. The error message indicates that the host header in the request is not recognized by the Django application.

Common Scenarios

This error often occurs when deploying a Django application to a new environment or server, or when accessing the application through a new domain or IP address.

Explaining the DisallowedHost Issue

The DisallowedHost exception is raised when the HTTP request's host header does not match any of the allowed hosts specified in the Django settings. This is a security measure to prevent HTTP Host header attacks, which can occur when an attacker sends a request with a fake host header.

Understanding ALLOWED_HOSTS

The ALLOWED_HOSTS setting in Django is a list of strings representing the host/domain names that this Django site can serve. This setting is crucial for security, especially when deploying your application to production.

Steps to Fix the DisallowedHost Error

To resolve the DisallowedHost error, you need to update the ALLOWED_HOSTS setting in your settings.py file to include the host that is causing the error.

Step-by-Step Resolution

  1. Open your Django project's settings.py file.
  2. Locate the ALLOWED_HOSTS setting. It typically looks like this:
    ALLOWED_HOSTS = []
  1. Add the host name or IP address that you want to allow. For example, if your application is hosted at example.com, update the setting as follows:
    ALLOWED_HOSTS = ['example.com']
  1. If you are developing locally and want to allow all hosts, you can use:
    ALLOWED_HOSTS = ['*']
  1. Save the changes and restart your Django server.

Additional Resources

For more information on Django's security settings, you can refer to the official Django documentation on ALLOWED_HOSTS. Additionally, for a deeper understanding of HTTP Host header attacks, you can read more on OWASP.

By following these steps, you should be able to resolve the DisallowedHost error and ensure that your Django application is accessible from the desired hosts.

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