[Solved] Given this FastAPI code snippet, what will be the output if the JWT token is expired?from fastapi import Depends, HTTPExceptionfrom fastapi.... | FastAPI

FastAPI - Authentication and Security

Given this FastAPI code snippet, what will be the output if the JWT token is expired?

from fastapi import Depends, HTTPException
from fastapi.security import OAuth2PasswordBearer
oauth2_scheme = OAuth2PasswordBearer(tokenUrl="token")
async def verify_token(token: str = Depends(oauth2_scheme)):
    if token == "expired":
        raise HTTPException(status_code=401, detail="Token expired")
    return "Valid token"
result = await verify_token("expired")

ARaises HTTPException with status 401 and detail 'Token expired'

BReturns string 'Valid token'

CRaises HTTPException with status 403

DReturns None

Step-by-Step Solution

Solution:

Step 1: Check token value in function
If token equals "expired", function raises HTTPException with 401 status.
Step 2: Analyze call with token "expired"
Calling with "expired" triggers the exception, no return string.
Final Answer:
Raises HTTPException with status 401 and detail 'Token expired' -> Option A
Quick Check:
Expired token triggers 401 HTTPException [OK]

Quick Trick: Expired JWT tokens cause 401 Unauthorized error [OK]

Common Mistakes:

MISTAKES

Expecting 'Valid token' return on expired token
Confusing 401 with 403 status code
Assuming function returns None on error

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Given this FastAPI code snippet, what will be the output if the JWT token is expired?

Step 1: Check token value in function

Step 2: Analyze call with token "expired"

Final Answer:

Quick Check:

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