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If you add middleware to a FastAPI app, which requests will it process?

medium📝 component behavior Q5 of 15
FastAPI - Middleware and Hooks
If you add middleware to a FastAPI app, which requests will it process?
AOnly requests to routes explicitly linked to the middleware
BOnly requests to routes defined after adding middleware
CAll requests to any route in the app
DOnly requests with specific HTTP methods like POST
Step-by-Step Solution
Solution:

  1. Step 1: Recall middleware scope in FastAPI

    Middleware added to the app processes every request globally, regardless of route or method.

  2. Step 2: Eliminate incorrect options

    Middleware does not discriminate by route definition order or HTTP method.

  3. Final Answer:

    All requests to any route in the app -> Option C

  4. Quick Check:

    Middleware processes all app requests [OK]
Quick Trick: Middleware affects all routes once added to app [OK]
Common Mistakes:
MISTAKES
  • Thinking middleware only affects routes added after it
  • Believing middleware must be linked per route
  • Assuming middleware filters by HTTP method

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