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What is the main purpose of the TrustedHostMiddleware in FastAPI?

easy🧠 Conceptual Q11 of 15
FastAPI - Middleware and Hooks
What is the main purpose of the TrustedHostMiddleware in FastAPI?
ATo block requests from hosts not in the allowed list
BTo speed up the response time of the app
CTo handle database connections securely
DTo manage user authentication tokens
Step-by-Step Solution
Solution:

  1. Step 1: Understand middleware role

    The TrustedHostMiddleware is designed to filter incoming requests based on their host header.

  2. Step 2: Identify its security purpose

    It blocks requests from hosts not explicitly allowed to protect against host header attacks.

  3. Final Answer:

    To block requests from hosts not in the allowed list -> Option A

  4. Quick Check:

    TrustedHostMiddleware blocks unknown hosts = D [OK]
Quick Trick: Remember: Trusted hosts means allowed hosts only [OK]
Common Mistakes:
MISTAKES
  • Confusing it with authentication middleware
  • Thinking it speeds up app performance
  • Assuming it manages database connections

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