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Why does Django require async middleware to define an async __call__ method instead of a synchronous one?

hard📝 Conceptual Q10 of 15
Django - Async Django
Why does Django require async middleware to define an async __call__ method instead of a synchronous one?
ATo force all middleware to run in separate threads
BTo allow non-blocking execution and proper awaiting of async views and downstream middleware
CTo automatically convert all synchronous code to asynchronous
DTo disable middleware caching for async requests
Step-by-Step Solution
Solution:
  1. Step 1: Understand async __call__ role

    Async __call__ lets middleware await async views and other async middleware without blocking.
  2. Step 2: Eliminate incorrect options

    Options A, C, and D describe unrelated or incorrect behaviors.
  3. Final Answer:

    To allow non-blocking execution and proper awaiting of async views and downstream middleware -> Option B
  4. Quick Check:

    Async __call__ enables non-blocking await [OK]
Quick Trick: Async __call__ enables awaiting downstream async code [OK]
Common Mistakes:
MISTAKES
  • Thinking async __call__ runs in separate threads
  • Believing it converts sync code automatically
  • Assuming it disables caching

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