What will happen if a middleware's call method does not call the wrapped app and returns None instead?

medium📝 component behavior Q5 of 15

Flask - Middleware and Extensions

What will happen if a middleware's __call__ method does not call the wrapped app and returns None instead?

AFlask will ignore the middleware and proceed

BThe request will succeed with empty response

CThe request will hang or cause an error

DThe middleware will automatically call the app

Step-by-Step Solution

Solution:

Step 1: Understand middleware call chain
Middleware must call wrapped app to continue request processing.
Step 2: Consequence of missing call
Not calling app causes request to hang or error due to no response.
Final Answer:
The request will hang or cause an error -> Option C
Quick Check:
Middleware must call wrapped app [OK]

Quick Trick: Always call wrapped app in middleware __call__ [OK]

Common Mistakes:

MISTAKES

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