no 'access-control-allow-origin' header is present on the requested resource GraphQL Django

To resolve the issue of the missing 'Access-Control-Allow-Origin' header in a Django GraphQL application, you can follow these steps:

  1. Install the necessary packages:

  2. Install the django-cors-headers package by running pip install django-cors-headers.

  3. Configure the CORS settings in your Django project:

  4. Open the settings.py file of your Django project.
  5. Add 'corsheaders' to the INSTALLED_APPS list.
  6. Add CORS_ORIGIN_ALLOW_ALL = True to allow requests from any origin. Alternatively, you can specify specific origins using CORS_ORIGIN_WHITELIST or CORS_ORIGIN_REGEX_WHITELIST.

  7. Add 'corsheaders.middleware.CorsMiddleware' to the MIDDLEWARE list.

  8. Add the GraphQL view to the URL configuration:

  9. Open the urls.py file of your Django project.
  10. Import the GraphQLView from graphene_django.views.

  11. Add a URL pattern for your GraphQL view, for example: ```python from graphene_django.views import GraphQLView

    urlpatterns = [ # ... other URL patterns path('graphql/', GraphQLView.as_view(graphiql=True)), ] ```

  12. Update the GraphQL view to include the CORS headers:

  13. Open the views.py file of your Django project.
  14. Import the csrf_exempt decorator from django.views.decorators.csrf.

  15. Decorate the GraphQLView with the csrf_exempt decorator, like this: ```python from django.views.decorators.csrf import csrf_exempt from graphene_django.views import GraphQLView

    urlpatterns = [ # ... other URL patterns path('graphql/', csrf_exempt(GraphQLView.as_view(graphiql=True))), ] ```

  16. Restart your Django server for the changes to take effect.

By following these steps, you should be able to resolve the issue of the missing 'Access-Control-Allow-Origin' header in your Django GraphQL application. This will allow the browser to make cross-origin requests to your GraphQL server.