Why Do My AJAX POST Requests Fail with a Django CSRF Check?

Django CSRF Check Failure with Ajax POST Requests

Introduction:

Django implements a built-in mechanism to protect against Cross-Site Request Forgery (CSRF) attacks. However, this protection can sometimes interfere with AJAX POST requests. This article will explain the issue and provide a solution.

Problem:

An AJAX POST request to a Django view may fail with a 403 Forbidden error due to Django's CSRF protection. The error occurs when the CSRF token in the request does not match the one generated by Django.

Cause:

Ajax requests (using JavaScript) might not automatically send the CSRF token in the request header, which leads to the CSRF check failing in Django.

Solution:

To resolve the issue, manually add the CSRF token to the Ajax request's data body. This can be done using the $.ajax function with the data property:

$.ajax({
    data: {
        somedata: 'somedata',
        moredata: 'moredata',
        csrfmiddlewaretoken: '{{ csrf_token }}'
    },
    ...  // other Ajax options
});

Verification:

To verify that the token is correct, you can inspect the value of the csrfmiddlewaretoken cookie before making the Ajax request. This cookie contains the csrf token.

Alternative:

As mentioned in the original question, disabling the CSRF check for the view using the csrf_exempt decorator is not an ideal approach. It is recommended to ensure compliance with the CSRF protection mechanism.

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