[Solved] What will be the HTTP status code and response body if... What will be the HTTP status code and response body if the following FastAPI endpoint raises a ValueError without a custom exception handler? | FastAPI

FastAPI - Error Handling

What will be the HTTP status code and response body if the following FastAPI endpoint raises a ValueError without a custom exception handler? ```python from fastapi import FastAPI app = FastAPI() @app.get("/test") async def test(): raise ValueError("Invalid value") ```

A500 Internal Server Error with default HTML error page

B400 Bad Request with JSON error message

C422 Unprocessable Entity with validation error details

D404 Not Found with empty body

Step-by-Step Solution

Solution:

Step 1: Identify default FastAPI behavior for unhandled exceptions
FastAPI returns a 500 Internal Server Error for unhandled exceptions like ValueError.
Step 2: Understand default response format
By default, the response is an HTML error page, not JSON, unless a custom handler is defined.
Final Answer:
500 Internal Server Error with default HTML error page -> Option A
Quick Check:
Unhandled exceptions = 500 error with HTML page [OK]

Quick Trick: Unhandled exceptions return 500 with HTML error by default [OK]

Common Mistakes:

MISTAKES

Expecting JSON error without custom handler
Confusing 422 validation errors with runtime exceptions
Assuming 400 or 404 status codes

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More FastAPI Quizzes

What will be the HTTP status code and response body if the following FastAPI endpoint raises a ValueError without a custom exception handler?

Step 1: Identify default FastAPI behavior for unhandled exceptions

Step 2: Understand default response format

Final Answer:

Quick Check:

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