[Solved] Given this FastAPI dependency: oauth2_scheme = OAuth2PasswordBearer(tokenUrl="token") @app.get("/users/me") async def read_users_me(token: str = Depends(oauth2_scheme)): return {"token":... | FastAPI

FastAPI - Authentication and Security

Given this FastAPI dependency:

oauth2_scheme = OAuth2PasswordBearer(tokenUrl="token")

@app.get("/users/me")
async def read_users_me(token: str = Depends(oauth2_scheme)):
    return {"token": token}

What will be the output if the client sends a request with header Authorization: Bearer abc123?

A{"token": "Bearer abc123"}

BHTTP 401 Unauthorized error

C{"token": "abc123"}

D{"token": null}

Step-by-Step Solution

Solution:

Step 1: Understand OAuth2PasswordBearer behavior
This class extracts only the token string after 'Bearer ' from the Authorization header.
Step 2: Analyze the returned value
The function returns a JSON with the token string, so it will return {"token": "abc123"}.
Final Answer:
{"token": "abc123"} -> Option C
Quick Check:
Bearer token string extracted = "abc123" [OK]

Quick Trick: OAuth2PasswordBearer strips 'Bearer ' prefix automatically [OK]

Common Mistakes:

MISTAKES

Expecting full 'Bearer abc123' string returned
Assuming 401 error without token validation
Thinking token is null if present

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More FastAPI Quizzes

Given this FastAPI dependency:

Step 1: Understand OAuth2PasswordBearer behavior

Step 2: Analyze the returned value

Final Answer:

Quick Check:

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