Python server programming: using django-cors-headers to solve cross-domain problems

With the rapid development of front-end technology, more and more websites adopt a front-end and back-end separation architecture. The front-end and back-end use AJAX or FETCH to communicate to improve user experience. However, under this architecture, we often encounter cross-domain problems, so we need to use some plug-ins to solve this problem. Among them, Django-cors-headers is a very good choice. It can solve cross-domain problems very conveniently and is simple and easy to use.

1. What is cross-domain?

In web development, cross-origin resource sharing (Cross-Origin Resource Sharing) refers to the problem that when the browser sends an AJAX request, the requested domain name is different from the domain name of the current page, causing the request to be rejected. This is designed to enhance browser security.

2. What are django-cors-headers?

django-cors-headers is a Django application that handles cross-domain issues between Django backend and frontend web pages. It can easily solve AJAX request issues between different domain names, bringing a better user experience.

3. Install django-cors-headers

To use django-cors-headers, you first need to ensure that you have installed and enabled Django. Next, you can install django-cors-headers through pip:

pip install django-cors-headers

After the installation is complete, you need to configure it in Django's settings.py file. Add in INSTALLED_APPS:

INSTALLED_APPS = [
    # ...
    'corsheaders',
    # ...
]

Then add in MIDDLEWARE:

MIDDLEWARE = [
    # ...
    'corsheaders.middleware.CorsMiddleware',
    'django.middleware.common.CommonMiddleware',
    # ...
]

Finally, add at the bottom of settings.py:

CORS_ORIGIN_ALLOW_ALL = True

This completes django-cors- Installation and configuration of headers. Note: In a production environment, domain-specific authorization should be used instead of allow any origin.

4. Use django-cors-headers

After installing and configuring django-cors-headers, we can use it in Django views to solve cross-domain problems. For example, we can add @csrf_exempt and @require_http_methods(['POST']) to the view function, and add the following code to the return result:

from django.http import JsonResponse

from django.views.decorators.csrf import csrf_exempt
from django.views.decorators.http import require_http_methods

from corsheaders.decorators import cors_exempt

@csrf_exempt
@require_http_methods(['POST'])
@cors_exempt
def your_view(request):
    data = {'result': 'success'}
    response = JsonResponse(data)
    response['Access-Control-Allow-Origin'] = '*'
    response['Access-Control-Allow-Methods'] = 'POST, OPTIONS'
    response['Access-Control-Allow-Headers'] = 'Accept, Content-Type, Authorization'
    response['Access-Control-Max-Age'] = '86400'
    return response

After this configuration, when using AJAX or FETCH requests There will be no cross-domain issues.

5. Summary

For web applications that use AJAX or FETCH to separate the front and back ends, the cross-domain problem is a problem that must be solved. django-cors-headers is a very good choice, it can easily solve cross-domain problems and provides many configuration options that can be used according to the actual situation. With the addition of django-cors-headers, we can develop great web applications more easily and provide a better experience.

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