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Django is a high-level Python web framework that encourages rapid development and clean, pragmatic design. It is known for its simplicity, flexibility, reliability, and scalability. Django follows the "Don't Repeat Yourself" (DRY) principle, which helps developers build applications quickly and with less code.
When working with Django, you might encounter the following error message: django.core.exceptions.SuspiciousOperation: Invalid HTTP_HOST header: 'host'. You may need to add 'host' to ALLOWED_HOSTS.
This error typically occurs when the HTTP_HOST header in a request is not recognized or allowed by your Django application.
When this error occurs, your application may not respond to requests as expected, and you might see this error message in your logs or in the browser when trying to access your application.
The error is raised because Django is designed to prevent HTTP Host header attacks by validating the host header against a list of allowed hosts. This is configured in the ALLOWED_HOSTS
setting in your settings.py
file. If a request is made with a host header that is not in this list, Django raises a SuspiciousOperation
exception.
This issue often arises when deploying a Django application to a new environment or when accessing the application through a new domain or IP address that hasn't been added to the ALLOWED_HOSTS
list.
To resolve this issue, you need to update the ALLOWED_HOSTS
setting in your Django project's settings.py
file to include the host from which you are accessing the application.
settings.py
file.ALLOWED_HOSTS
setting. It is usually defined as an empty list or with some predefined hosts.ALLOWED_HOSTS = ['yourdomain.com', 'localhost', '127.0.0.1']
Ensure that you include all the necessary hosts that your application will be accessed from.
For more information on Django's ALLOWED_HOSTS
setting, you can refer to the official Django documentation.
By correctly configuring the ALLOWED_HOSTS
setting, you can prevent the SuspiciousOperation
error related to invalid HTTP_HOST headers. This ensures that your Django application remains secure and accessible from the intended hosts.
(Perfect for DevOps & SREs)
(Perfect for DevOps & SREs)