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What happens if you define multiple startup event handlers in FastAPI?

medium📝 component behavior Q5 of 15
FastAPI - Middleware and Hooks
What happens if you define multiple startup event handlers in FastAPI?
AOnly the first startup handler runs
BAll startup handlers run in the order they are defined
COnly the last startup handler runs
DFastAPI raises an error on multiple startup handlers
Step-by-Step Solution
Solution:

  1. Step 1: Recall FastAPI event handler behavior

    FastAPI allows multiple startup handlers; all run sequentially in definition order.

  2. Step 2: Exclude error or single handler cases

    No error occurs, and no handler is skipped.

  3. Final Answer:

    All startup handlers run in the order they are defined -> Option B

  4. Quick Check:

    Multiple startup handlers = all run [OK]
Quick Trick: Multiple startup events run sequentially [OK]
Common Mistakes:
MISTAKES
  • Thinking only one handler runs
  • Expecting errors on multiple handlers
  • Assuming random execution order

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