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How can you combine TrustedHostMiddleware with CORS middleware in FastAPI to allow trusted hosts and cross-origin requests safely?

hard🚀 Application Q9 of 15
FastAPI - Middleware and Hooks
How can you combine TrustedHostMiddleware with CORS middleware in FastAPI to allow trusted hosts and cross-origin requests safely?
AAdd only TrustedHostMiddleware, CORS is not needed
BAdd TrustedHostMiddleware first, then CORSMiddleware with allowed origins
CAdd CORSMiddleware first, then TrustedHostMiddleware with allowed_hosts
DAdd only CORSMiddleware, TrustedHostMiddleware is redundant
Step-by-Step Solution
Solution:

  1. Step 1: Understand middleware order importance

    TrustedHostMiddleware should run before (outermost) CORSMiddleware to block untrusted hosts early.

  2. Step 2: Configure CORSMiddleware with allowed origins

    Add CORSMiddleware after TrustedHostMiddleware so that CORS headers are applied only to trusted hosts.

  3. Final Answer:

    Add TrustedHostMiddleware first, then CORSMiddleware with allowed origins -> Option B

  4. Quick Check:

    TrustedHostMiddleware (outer) before CORSMiddleware = C [OK]
Quick Trick: Order matters: TrustedHostMiddleware first, then CORSMiddleware [OK]
Common Mistakes:
MISTAKES
  • Reversing middleware order
  • Skipping TrustedHostMiddleware
  • Assuming CORS replaces host filtering

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