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What will happen if a custom middleware's dispatch method forgets to call call_next(request)?

medium📝 component behavior Q5 of 15
FastAPI - Middleware and Hooks
What will happen if a custom middleware's dispatch method forgets to call call_next(request)?
AAn exception will be raised immediately
BThe request will proceed normally without middleware effect
CFastAPI will automatically call call_next internally
DThe request will hang and never reach the endpoint
Step-by-Step Solution
Solution:

  1. Step 1: Understand call_next role

    call_next(request) passes the request to the next middleware or endpoint.

  2. Step 2: Consequence of missing call_next

    If call_next is not called, the request is not forwarded, causing the request to hang indefinitely.

  3. Final Answer:

    The request will hang and never reach the endpoint -> Option D

  4. Quick Check:

    Missing call_next = request hangs [OK]
Quick Trick: Always call call_next(request) to continue request flow [OK]
Common Mistakes:
MISTAKES
  • Assuming FastAPI calls call_next automatically
  • Expecting an immediate error instead of hanging
  • Thinking request proceeds without call_next

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