middleware

problem

python starlette fastapi cors middleware auth debugging

126 tok

Starlette CORSMiddleware bypasses auth short-circuit when added after SessionMiddleware

Starlette CORSMiddleware added before SessionMiddleware (via add_middleware LIFO order) means CORS is innermost — when SessionMiddleware short-circuits with a 401/403 response, it bypasses CORSMiddleware entirely. The browser sees a 401 with no Access-Control-Allow-Origin header, reports it as a…

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