Mastering Django: Core

Middleware ordering

Table 17.1 provides some hints about the ordering of various Django middleware classes:

Class	Notes
UpdateCacheMiddleware	Before those that modify the Vary header (SessionMiddleware, GZipMiddleware, LocaleMiddleware).
GZipMiddleware	Before any middleware that may change or use the response body. After UpdateCacheMiddleware: Modifies Vary header.
ConditionalGetMiddleware	Before CommonMiddleware: uses its Etag header when USE_ETAGS = True.
SessionMiddleware	After UpdateCacheMiddleware: Modifies Vary header.
LocaleMiddleware	One of the topmost, after SessionMiddleware (uses session data) and CacheMiddleware (modifies Vary header).
CommonMiddleware	Before any middleware that may change the response (it calculates ...