How can you chain two WSGI middleware classes, MidOne and MidTwo, around a Flask app app so that MidOne processes requests first?

hard📝 Application Q9 of 15

Flask - Middleware and Extensions

How can you chain two WSGI middleware classes, MidOne and MidTwo, around a Flask app app so that MidOne processes requests first?

Aapp = MidOne(MidTwo(app))

Bapp = MidTwo(MidOne(app))

Capp = MidOne(app); app = MidTwo(app)

Dapp = MidTwo(app); app = MidOne(app)

Step-by-Step Solution

Solution:

Step 1: Understand middleware chaining order
The outer middleware processes requests first, so it should wrap the inner middleware.
Step 2: Apply correct wrapping
Wrapping app first with MidTwo, then wrapping that with MidOne means MidOne runs first.
Final Answer:
app = MidOne(MidTwo(app)) -> Option A
Quick Check:
Outer middleware runs first = MidOne(MidTwo(app)) [OK]

Quick Trick: Wrap inner first, outer last to control order [OK]

Common Mistakes:

MISTAKES

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