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What is the main purpose of creating custom middleware in FastAPI?

easy🧠 Conceptual Q11 of 15
FastAPI - Middleware and Hooks
What is the main purpose of creating custom middleware in FastAPI?
ATo handle user authentication only
BTo define database models
CTo create HTML templates
DTo run code before and after each request is processed
Step-by-Step Solution
Solution:

  1. Step 1: Understand middleware role

    Middleware runs code around request processing, before and after the main handler.

  2. Step 2: Identify correct purpose

    Custom middleware is not for database or templates but for request/response handling.

  3. Final Answer:

    To run code before and after each request is processed -> Option D

  4. Quick Check:

    Middleware = pre/post request code [OK]
Quick Trick: Middleware wraps requests to add extra processing [OK]
Common Mistakes:
MISTAKES
  • Confusing middleware with database or template code
  • Thinking middleware only handles authentication
  • Believing middleware runs only after requests

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