Failure of Django CSRF Token Authentication: ELB -> Apache2 -> uwsgi

Originally, the configuration was AWS ELB -> Apache2 -> mod_wsgi, but after changing the Django server to use uWSGI, the configuration became AWS ELB -> Apache2 -> uWSGI. After this change, I started experiencing issues with Django's CSRF authentication, such as when submitting a login form.

When I checked with DEBUG = True, I saw the following message:

Access Forbidden (403)

The request was aborted due to failure in CSRF verification. Help

Reason given for failure:

Referer checking failed - https://example.com.com/some-path/ does not match any trusted origins.

In general, this can occur when there is a genuine Cross-Site Request Forgery, or when Django's CSRF mechanism has not been used correctly. For POST forms, you need to ensure:

Your browser is accepting cookies.
The view function passes a request to the template's render method.
In the template, there is a {% csrf_token %} template tag inside each POST form that targets an internal URL.
If you are not using CsrfViewMiddleware, then you must use csrf_protect on any views that use the csrf_token template tag, as well as those that accept the POST data.

You're seeing the help section of this page because you have DEBUG = True in your Django settings file. Change that to False, and only the initial error message will be displayed.

You can customize this page using the CSRF_FAILURE_VIEW setting.

The ELB receives HTTPS, sends requests to Apache on port 80, and uWSGI is listening for HTTP protocol (not uWSGI protocol).

The Apache configuration is as follows:

ProxyPass / http://127.0.0.1:8081/ ProxyPassReverse / http://127.0.0.1:8081/

Alias /static/ /var/django/xxxxx/staticfiles/ ProxyPass /static/ !

Something like this.

Upon searching the Django code, I found in csrf.py:

REASON_BAD_REFERER = "Referer checking failed - %s does not match any trusted origins."

It appears that adding the domain to CSRF_TRUSTED_ORIGINS should work.

CSRF_TRUSTED_ORIGINS = [".example.com"] This should do the trick.