Not available in Django4

In Django 4, an error occurs when the cache time is set

AttributeError: 'TemplateResponse' object has no attribute 'headers'

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The error you are seeing when trying to set the cache time with django-robots in Django version 4 is likely caused by a change in the TemplateResponse object which no longer has a headers attribute that django-robots is trying to access.

One way to work around this issue is to manually set the cache headers in a custom middleware for your Django project. Here's an example implementation that you can adapt to your own project:

from django.http import HttpResponseNotModified
from django.utils.cache import patch_response_headers

class CustomRobotsMiddleware:
    def __init__(self, get_response):
        self.get_response = get_response
        
    def __call__(self, request):
        response = self.get_response(request)
        if request.path == '/robots.txt':
            if not response.status_code == 304:
                patch_response_headers(response, cache_timeout=600)
            else:
                response = HttpResponseNotModified()
                
        return response

This middleware will check if the requested path is /robots.txt and then either set the cache headers with a timeout of 600 seconds (10 minutes) or return a HttpResponseNotModified object if the response has not been modified since the last request. You can adjust the cache timeout to the desired value for your use case.

To use this middleware, add it to the MIDDLEWARE setting in your Django settings file:

MIDDLEWARE = [
# other middleware classes here...
'path.to.CustomRobotsMiddleware',
]

Make sure to replace path.to with the actual path to your middleware class.

With this middleware in place, django-robots should be able to set the cache time for the robots.txt file properly in Django version 4.

---

The issue you're experiencing with the django-robots package in Django version 4 is due to some changes in the Django framework. The TemplateResponse object no longer has a headers attribute. Instead, you will use the ._headers attribute, which is a dictionary that holds the headers for the response.

Find the place in the code where the .headers attribute is being accessed and change it to ._headers. After making the change, test the package to ensure it's working as expected.

---

The error you're seeing in Django 4 when setting the cache time for django-robots is due to changes in the way TemplateResponse objects are handled in Django 4.

To fix this error, you can modify the RobotsView class in django_robots/views.py to use a HttpResponse object instead of a TemplateResponse object:

from django.http import HttpResponse
from django.views.generic import TemplateView
from django_robots.utils import get_robots_txt

class RobotsView(TemplateView):
    content_type = 'text/plain'

    def render_to_response(self, context, **kwargs):
        content = get_robots_txt()
        response = HttpResponse(content, content_type=self.content_type, **kwargs)
        response['Cache-Control'] = 'max-age=86400'
        return response

In this modified implementation, we're using a HttpResponse object instead of a TemplateResponse object, and setting the Cache-Control header directly on the response object. This should resolve the AttributeError you're seeing.