[Solved] Examine the following FastAPI code snippet for Bearer token handling: from fastapi import FastAPI, Depends from fastapi.... | FastAPI

FastAPI - Authentication and Security

Examine the following FastAPI code snippet for Bearer token handling:

from fastapi import FastAPI, Depends
from fastapi.security import OAuth2PasswordBearer

app = FastAPI()
oauth2_scheme = OAuth2PasswordBearer(tokenUrl="token")

@app.get("/profile")
async def profile(token: str = oauth2_scheme):
    return {"token": token}

What is the main issue with this code?

AThe dependency should be wrapped with Depends() to work correctly

BOAuth2PasswordBearer requires a different tokenUrl parameter

CThe endpoint should be async def with no parameters

DThe token variable should be an integer, not a string

Step-by-Step Solution

Solution:

Step 1: Review dependency injection syntax
FastAPI requires dependencies to be declared with Depends() to be properly injected.
Step 2: Identify the error
The code uses 'token: str = oauth2_scheme' instead of 'token: str = Depends(oauth2_scheme)'. This prevents FastAPI from calling the dependency.
Final Answer:
The dependency should be wrapped with Depends() -> Option A
Quick Check:
Always use Depends() to declare dependencies in FastAPI. [OK]

Quick Trick: Wrap dependencies with Depends() to enable injection [OK]

Common Mistakes:

MISTAKES

Omitting Depends() when declaring dependencies
Misunderstanding the tokenUrl parameter purpose
Incorrectly typing the token variable

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More FastAPI Quizzes

Examine the following FastAPI code snippet for Bearer token handling:

Step 1: Review dependency injection syntax

Step 2: Identify the error

Final Answer:

Quick Check:

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