FastAPI - Error Handling
You want to create a FastAPI endpoint that returns a custom error response model for both 400 and 404 errors. Which of the following is the correct way to define the
responses parameter?You want to create a FastAPI endpoint that returns a custom error response model for both 400 and 404 errors. Which of the following is the correct way to define the responses parameter?
hard🚀 Application Q8 of 15
Step-by-Step Solution
Solution:
Step 1: Recall correct 'responses' dictionary format
The keys must be integers for status codes, and values must be dictionaries with a 'model' key.Step 2: Check each option
responses={400: {"model": ErrorModel}, 404: {"model": ErrorModel}} correctly maps 400 and 404 to dicts with 'model': ErrorModel. Options A and B assign model directly, which is incorrect. responses=[400, 404], model=ErrorModel is invalid syntax.Final Answer:
responses={400: {"model": ErrorModel}, 404: {"model": ErrorModel}} -> Option CQuick Check:
Multiple error models use dict with 'model' key per status code [OK]
Quick Trick: Map each status code to dict with 'model' key in 'responses' [OK]
Common Mistakes:
MISTAKES- Assigning model class directly without dict
- Using list instead of dict for responses
- Assigning model directly with string keys
Master "Error Handling" in FastAPI
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