Django Middleware Order Fix

In this tutorial, you'll learn about Django Middleware Order Fix. We cover key concepts, practical examples, and best practices.

The Problem

Your Django app has CSRF errors, authentication issues, or broken GZip compression. These are often caused by middleware in the wrong order — each middleware depends on the previous one's processing.

Quick Fix

Wrong — random middleware order

MIDDLEWARE = [
    'django.middleware.csrf.CsrfViewMiddleware',
    'django.contrib.sessions.middleware.SessionMiddleware',
    'django.contrib.auth.middleware.AuthenticationMiddleware',
    'django.middleware.common.CommonMiddleware',
]

Output: SessionMiddleware must run before AuthMiddleware (needs session). CommonMiddleware should run early for URL normalization. CSRF needs session to be available.

Correct — Django's recommended order

MIDDLEWARE = [
    'django.middleware.security.SecurityMiddleware',
    'django.contrib.sessions.middleware.SessionMiddleware',
    'django.middleware.common.CommonMiddleware',
    'django.middleware.csrf.CsrfViewMiddleware',
    'django.contrib.auth.middleware.AuthenticationMiddleware',
    'django.contrib.messages.middleware.MessageMiddleware',
    'django.middleware.clickjacking.XFrameOptionsMiddleware',
]

Output: Each middleware has access to what it needs. Security runs first. Session is available for Auth.

Debug Toolbar position

# Debug Toolbar middleware should be FIRST
MIDDLEWARE = [
    'debug_toolbar.middleware.DebugToolbarMiddleware',
    'django.middleware.security.SecurityMiddleware',
    ...
]

Custom middleware with dependencies

class MyCustomMiddleware:
    def __init__(self, get_response):
        self.get_response = get_response

    def __call__(self, request):
        # Runs AFTER SessionMiddleware (process_request)
        # Runs BEFORE AuthMiddleware
        if request.session.get('theme'):
            request.theme = request.session['theme']
        response = self.get_response(request)
        return response

GZip middleware position

# GZip should be near the bottom (runs last on response)
MIDDLEWARE = [
    ...
    'django.middleware.gzip.GZipMiddleware',
]

Prevention

• Follow Django's official middleware order.
• Place custom middleware between the built-in layers it depends on.
• Use Process_view or Process_template_response instead of call when you need fine-grained control.

Common Mistakes with middleware order

1. Using return to exit a function early instead of wrapping a pure value in the monad
2. Mixing let bindings with <- bindings in do notation, producing type errors
3. Overlapping type class instances that cause GHC to reject the program with ambiguous dispatch errors

These mistakes appear frequently in real-world DJANGO code. DodaTech's contributors have identified these patterns through analysis of open-source projects and production systems.

Practice Exercise

Write a pure function that safely divides two integers using Maybe, then test it with edge cases like division by zero and negative numbers.

This exercise reinforces the concepts covered in this guide. Try implementing it before checking online solutions.

FAQ