Why does middleware order matter in Django?

Explains Django's nested middleware stack, short-circuiting, exceptions, and response unwinding.

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TL;DR

Django middleware wraps the next layer like nested functions. Request processing enters middleware from top to bottom, then the response comes back from bottom to top. A middleware can return a response without calling the next layer, so lower middleware and the view will not run. Dependencies between layers matter; for example, session middleware must establish session state before authentication middleware uses it.

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Whether cross-cutting behavior is placed with a correct request and response lifecycle model.

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Middleware order determines which request context exists and which responses each layer can observe.
Django middleware wraps the next layer like nested functions. Request processing enters middleware from top to bottom, then the response comes back from bottom to top. A middleware can return a response without calling the next layer, so lower middleware and the view will not run. Dependencies between layers matter; for example, session middleware must establish session state before authentication middleware uses it.
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Exception handling follows the same onion model, but I rely on Django's documented hooks rather than assuming a global try/catch around every lower layer. Placement determines whether logging, security headers, CORS, or tracing sees short-circuited and error responses. Middleware should stay bounded and request-oriented; slow database work or domain workflows there affect every matching request and are difficult to reason about.

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Treating middleware as unordered event subscribers.
Assuming every middleware runs for every response.
Doing unbounded application work before routing.

Why does middleware order matter in Django?

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