Unleash the Power of Django by Learning How to Set Up Your Allowed Hosts with These Simple Code Examples

Table of content

  1. Introduction
  2. What is Django?
  3. Why is Allowed Hosts important in Django?
  4. Simple Code Examples to Set Up Allowed Hosts
  5. How to Test Allowed Hosts in Django
  6. Best Practices for Using Allowed Hosts in Django
  7. Conclusion


In Django, Allowed Hosts is an important security feature that restricts which domains can make HTTP requests to your web application. Understanding how to set up your Allowed Hosts properly is essential for protecting your website from unauthorized access and potential security breaches. In this article, we'll explore how to unleash the power of Django by learning how to set up your Allowed Hosts with some simple code examples.

Django is a high-level web framework that enables developers to create robust and scalable web applications quickly and easily. It offers a wide range of features and tools, including a powerful ORM, robust security features, and advanced caching techniques. Django's security features, including Allowed Hosts, provide developers with the necessary tools to protect their applications from cross-site request forgery (CSRF) attacks, DNS rebinding attacks, and more.

Setting up Allowed Hosts in Django is a straightforward process. First, you need to configure the ALLOWED_HOSTS setting in your settings.py file. You can specify a list of domain names or IP addresses that are allowed to make requests to your web application. When a user tries to access your application from an unauthorized domain or IP address, Django raises a SuspiciousOperation exception, preventing the request from being processed. By configuring Allowed Hosts, you can reduce the risk of unauthorized access and protect your application's sensitive data.

What is Django?

Django is a high-level web framework that is designed to help developers build powerful and scalable web applications. Developed in Python, Django prioritizes clean code, strong security, and rapid development. It comes with an extensive set of built-in features and libraries, including user authentication, ORM, template engine, routing system, and more. With Django, developers can create complex web applications with ease and efficiency.

One of the things that sets Django apart from other web frameworks is its flexibility and customization options. Django allows developers to define their own settings and configurations, such as defining the allowed hosts or setting up the database connection. This makes it easy for developers to tailor the framework to their own needs, while still taking advantage of its built-in features and libraries.

Django is also known for its emphasis on security. The framework includes robust security features, like built-in protection against cross-site scripting (XSS), cross-site request forgery (CSRF), and SQL injection attacks. Additionally, Django makes it easy to implement user authentication and authorization, so that developers can build applications that are secure and protect their users' data.

Overall, Django is a popular and powerful web framework that is used by developers around the world. With its clean code, flexibility, and strong security features, developers can easily create complex web applications that meet their unique needs.

Why is Allowed Hosts important in Django?

In Django, Allowed Hosts is an important security feature that prevents unauthorized access to your website's content. When a user makes a request to a Django application, the request must include the correct host name to be processed. If the request does not include the correct host name, Django will reject the request, preventing any malicious attempts to gain access to your website.

The Allowed Hosts feature allows you to specify a list of valid host names that your Django application will accept requests from. By specifying a list of allowed hosts, you can prevent attackers from impersonating your website and accessing sensitive information or engaging in malicious activities.

Without the Allowed Hosts feature, an attacker could potentially modify the Host header in their request, thereby tricking your Django application into processing their request incorrectly. This could result in the exposure of sensitive data or the execution of unauthorized actions on your website.

Therefore, it is crucial to properly configure your Django application's Allowed Hosts setting to ensure the security of your website. Luckily, Django provides simple and effective tools for configuring Allowed Hosts, allowing you to easily set up and manage this important security feature.

Simple Code Examples to Set Up Allowed Hosts

When working with Django, setting up your allowed hosts is an important step to ensure that only authorized sources can access your application. Fortunately, the process is relatively simple and can be achieved with just a few lines of code.

To begin, open up your settings.py file and find the ALLOWED_HOSTS variable. By default, it is set to an empty list, which means that all hosts are allowed to access your application. To restrict access, simply add the domain or IP address of your authorized hosts to the list.

For example, if you only want users accessing your application from the domain example.com, you would add the following line of code:

ALLOWED_HOSTS = ['example.com']

You can also specify multiple hosts by separating them with commas:

ALLOWED_HOSTS = ['example.com', 'subdomain.example.com']

If you want to allow access from any subdomain of a particular domain, you can use a wildcard (*):

ALLOWED_HOSTS = ['*.example.com']

Keep in mind that adding hosts to your ALLOWED_HOSTS variable is only the first step in securing your application. You should also make sure to use HTTPS encryption and implement other security measures to protect your users' data.

Overall, setting up your allowed hosts in Django is a straightforward process that can be easily accomplished with just a few lines of code. By taking this step, you can ensure that your application remains secure and accessible only to authorized sources.

How to Test Allowed Hosts in Django

To test allowed hosts in Django, you can use the Django test client to simulate a request to your application with a specific host. The test client allows you to create test requests for your views and test the server response without actually making any HTTP requests.

To start testing, first make sure that your ALLOWED_HOSTS setting in your Django settings file includes the domain you want to test. Then, create a test case that uses the test client to make a request to your view with the specific host.

One example of is using the TestCase class in the unittest library. In this case, you can create a TestCase that inherits from Django's TestCase class and includes a test method that checks for the expected server response status code.

from django.test import TestCase, Client

class MyTestCase(TestCase):
    def test_allowed_host(self):
        client = Client(HTTP_HOST='example.com')
        response = client.get('/my-url/')
        self.assertEqual(response.status_code, 200)

In this example, the test_allowed_host method uses the test client to make a request with the HTTP_HOST header set to "example.com" and checks that the response has a status code of 200.

Testing your allowed hosts in Django can help ensure that your application is secure and that requests are only coming from trusted domains. By using the Django test client, you can easily simulate requests with different hosts and check that your server responds appropriately.

Best Practices for Using Allowed Hosts in Django

When developing a Django application, it's crucial to set up your allowed hosts to ensure the security of your application. Allowed hosts refer to the domain names or IP addresses that are authorized to access your Django app. include defining a whitelist of allowed domains, using environment variables instead of hardcoding the list of allowed hosts, and implementing HTTPS on your website.

Defining a whitelist of allowed domains can prevent unauthorized access to your application. Django has a built-in setting for allowed hosts, but it's recommended to define a custom whitelist for your specific use case. By setting a list of allowed domains, you can ensure that only authorized users have access to your application. Additionally, using environment variables to store the list of allowed hosts is more secure than hardcoding them into your code.

Another best practice for using allowed hosts in Django is to implement HTTPS on your website. HTTPS protects against man-in-the-middle attacks, where an attacker intercepts the communication between the user and the website. By encrypting the data, HTTPS ensures that the information transmitted between the user and your server is secure. It's also recommended to redirect all HTTP traffic to HTTPS to ensure that all data is encrypted.

In summary, setting up your allowed hosts is a critical aspect of building a secure Django application. By defining a whitelist of allowed domains, using environment variables to store the list, and implementing HTTPS, you can ensure the security of your application and prevent unauthorized access. By following these best practices, you can help protect your application from potential security threats.


In , setting up your allowed hosts in Django is a crucial step in securing your application against potential attackers. By explicitly listing the domains and IP addresses that are allowed to access your application, you can prevent unauthorized access and safeguard sensitive data from falling into the wrong hands.

With the code examples provided in this article, you should now have a solid understanding of how to configure your allowed hosts in Django. Remember to always keep security in mind when developing web applications, and to take the necessary precautions to protect your users' data.

As technology continues to advance, we can expect to see even more powerful tools and techniques emerge in the field of web development. Large Language Models like GPT-4 have already shown great potential in revolutionizing the way we create code, and it will be exciting to see how this technology develops in the years to come.

Overall, by staying up-to-date with the latest tools and techniques, and by taking a proactive approach to security, you can ensure that your web applications remain secure, scalable, and responsive in the face of evolving threats and challenges.

Cloud Computing and DevOps Engineering have always been my driving passions, energizing me with enthusiasm and a desire to stay at the forefront of technological innovation. I take great pleasure in innovating and devising workarounds for complex problems. Drawing on over 8 years of professional experience in the IT industry, with a focus on Cloud Computing and DevOps Engineering, I have a track record of success in designing and implementing complex infrastructure projects from diverse perspectives, and devising strategies that have significantly increased revenue. I am currently seeking a challenging position where I can leverage my competencies in a professional manner that maximizes productivity and exceeds expectations.

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