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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 'batteries-included' approach, offering a wide array of features such as an ORM, authentication, and an admin interface. Django is designed to help developers take applications from concept to completion as quickly as possible.
When working with Django, you might encounter the error: django.core.exceptions.SuspiciousOperation: Invalid HTTP_HOST header: 'host'.
This error typically occurs when the HTTP_HOST header in a request is not recognized or allowed by your Django application.
Upon making a request to your Django application, the server responds with an error message indicating a suspicious operation due to an invalid HTTP_HOST header. This can prevent your application from serving the request properly.
The error arises because Django uses the ALLOWED_HOSTS
setting to validate the HTTP_HOST
header of incoming requests. If the host is not listed in ALLOWED_HOSTS
, Django raises a SuspiciousOperation
exception to prevent potential security vulnerabilities such as HTTP Host header attacks.
The ALLOWED_HOSTS
setting is a list of strings representing the host/domain names that this Django site can serve. This is a security measure to prevent HTTP Host header attacks, which are possible even under many seemingly-safe web server configurations.
To resolve this issue, you need to ensure that the host making the request is included in your ALLOWED_HOSTS
setting in the settings.py
file of your Django project.
settings.py
file.ALLOWED_HOSTS
setting. It should look something like this:ALLOWED_HOSTS = []
example.com
, update the setting to:ALLOWED_HOSTS = ['example.com']
ALLOWED_HOSTS = ['*']
For more information on Django's ALLOWED_HOSTS
setting, you can refer to the official Django documentation. Additionally, understanding HTTP Host header attacks can provide further insights into why this security measure is crucial.
By ensuring that your ALLOWED_HOSTS
setting is correctly configured, you can prevent the SuspiciousOperation
error and secure your Django application against potential host header attacks. Always remember to update this setting when deploying your application to different environments.
(Perfect for DevOps & SREs)
(Perfect for DevOps & SREs)