Why production readiness matters in FastAPI - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create a basic FastAPI app instance.

FastAPI

from fastapi import [1]

app = [1]()

Drag options to blanks, or click blank then click option'

AFastAPI

BRequest

CResponse

DDepends

Attempts:

3 left

💡 Hint

Common Mistakes

Importing Request or Response instead of FastAPI.

Forgetting to add parentheses when creating the app instance.

The FastAPI class is used to create the app instance. This is the starting point for any FastAPI application.

2fill in blank

medium

Complete the code to define a GET endpoint that returns a welcome message.

FastAPI

@app.[1]("/")
async def read_root():
    return {"message": "Welcome to production-ready FastAPI!"}

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Aget

Bpost

Cput

Ddelete

Attempts:

3 left

💡 Hint

Common Mistakes

Using POST or PUT instead of GET for a simple read endpoint.

Misspelling the decorator name.

The @app.get decorator defines a GET HTTP method endpoint. This is used to read or fetch data.

3fill in blank

hard

Fix the error in the code to correctly run the FastAPI app with Uvicorn.

FastAPI

import uvicorn

if __name__ == "__main__":
    uvicorn.run("main:[1]", host="127.0.0.1", port=8000, reload=True)

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Aapp_instance

Bapplication

Capp

Dserver

Attempts:

3 left

💡 Hint

Common Mistakes

Using a wrong app instance name that does not exist.

Forgetting the colon between module and app name.

The string passed to uvicorn.run should be the module name and the FastAPI app instance name separated by a colon. Usually, the app instance is named app.

4fill in blank

hard

Fill both blanks to add middleware that logs requests and responses.

FastAPI

from fastapi.middleware.[1] import [2]

app.add_middleware([2])

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Alogging

Bcors

CLoggerMiddleware

DCORSMiddleware

Attempts:

3 left

💡 Hint

Common Mistakes

Confusing CORS middleware with logging middleware.

Using middleware class names that don't exist in FastAPI.

Middleware for logging requests is often custom or named LoggerMiddleware. The import path includes 'logging' for this example.

5fill in blank

hard

Fill all three blanks to create a dependency that checks an API key in headers.

FastAPI

from fastapi import Header, HTTPException, [1]

async def verify_api_key(api_key: str = [2](alias="X-API-Key")):
    if api_key != "secret123":
        raise [3](status_code=401, detail="Invalid API Key")

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ADepends

BHeader

CHTTPException

DRequest

Attempts:

3 left

💡 Hint

Common Mistakes

Using Request instead of Depends for dependency injection.

Not raising HTTPException for unauthorized access.

Dependencies in FastAPI use Depends. The API key is extracted from headers using Header. If invalid, an HTTPException is raised.