API key authentication in FastAPI - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to import the FastAPI class.

FastAPI

from fastapi import [1]
app = [1]()

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ADepends

BFastAPI

CRequest

DHTTPException

Attempts:

3 left

💡 Hint

Common Mistakes

Importing Request instead of FastAPI

Using HTTPException instead of FastAPI

Not importing anything

The FastAPI class is imported to create the app instance.

2fill in blank

medium

Complete the code to define the API key header name.

FastAPI

API_KEY_NAME = "[1]"

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AX-API-KEY

BAuthorization

CContent-Type

DUser-Agent

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'Authorization' header instead

Using 'Content-Type' header

Using 'User-Agent' header

The API key is usually sent in a custom header like 'X-API-KEY'.

3fill in blank

hard

Fix the error in the dependency function to get the API key from headers.

FastAPI

from fastapi import Header, HTTPException

async def get_api_key(api_key: str = Header(..., alias="[1]")):
    if api_key != "secret123":
        raise HTTPException(status_code=401, detail="Invalid API Key")
    return api_key

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Aapi_key

BAuthorization

CX-API-KEY

DapiKey

Attempts:

3 left

💡 Hint

Common Mistakes

Using the parameter name instead of the header name

Using 'Authorization' instead of 'X-API-KEY'

Using a wrong header name

The Header parameter must match the header name 'X-API-KEY' to extract the API key correctly.

4fill in blank

hard

Fill both blanks to protect the endpoint with API key dependency.

FastAPI

from fastapi import Depends

@app.get("/secure-data")
async def secure_data(api_key: str = Depends([1])):
    return {"message": "Access granted with key: " + [2]

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Aget_api_key

Bapi_key

CAPI_KEY_NAME

DHeader

Attempts:

3 left

💡 Hint

Common Mistakes

Using Header instead of get_api_key in Depends

Using API_KEY_NAME instead of api_key in return

Not using Depends at all

The endpoint uses Depends to call the get_api_key function, and the returned api_key is used in the response.

5fill in blank

hard

Fill all three blanks to create a complete FastAPI app with API key authentication.

FastAPI

from fastapi import FastAPI, Header, HTTPException, Depends

app = FastAPI()

API_KEY_NAME = "X-API-KEY"

async def get_api_key(api_key: str = Header(..., alias="[1]")):
    if api_key != "secret123":
        raise HTTPException(status_code=401, detail="Invalid API Key")
    return api_key

@app.get("/data")
async def read_data(api_key: str = Depends([2])):
    return {"message": "Hello, your API key is " + [3]

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AX-API-KEY

Bget_api_key

Capi_key

DAuthorization

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong header name in Header()

Not using Depends or wrong function in Depends

Using wrong variable name in return

The API key header name is 'X-API-KEY'. The dependency function is get_api_key. The returned api_key variable is used in the response.