Why error handling ensures reliability in FastAPI - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to import the FastAPI class.

FastAPI

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

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

AHTTPException

BRequest

CResponse

DFastAPI

Attempts:

3 left

💡 Hint

Common Mistakes

Importing Request or Response instead of FastAPI.

Trying to create app with a wrong class name.

FastAPI is the main class to create an app instance.

2fill in blank

medium

Complete the code to raise an HTTP 404 error when item not found.

FastAPI

from fastapi import HTTPException

@app.get('/items/{item_id}')
async def read_item(item_id: int):
    if item_id not in items:
        raise [1](status_code=404, detail='Item not found')
    return items[item_id]

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

AFastAPI

BHTTPException

CResponse

DRequest

Attempts:

3 left

💡 Hint

Common Mistakes

Using Request or Response instead of HTTPException.

Not raising an exception at all.

HTTPException is used to raise HTTP errors in FastAPI.

3fill in blank

hard

Fix the error in the exception handler decorator.

FastAPI

@app.exception_handler([1])
async def http_exception_handler(request, exc):
    return JSONResponse(status_code=exc.status_code, content={'message': exc.detail})

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

AHTTPException

BRequest

CResponse

DFastAPI

Attempts:

3 left

💡 Hint

Common Mistakes

Using Request or Response in the decorator instead of HTTPException.

Not specifying any exception class.

The exception handler must specify the exception class it handles, here HTTPException.

4fill in blank

hard

Fill both blanks to return a JSON response with error details.

FastAPI

from fastapi.responses import [1]

@app.exception_handler(HTTPException)
async def http_exception_handler(request, exc):
    return [2](status_code=exc.status_code, content={'error': exc.detail})

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

AJSONResponse

BHTMLResponse

CPlainTextResponse

DRedirectResponse

Attempts:

3 left

💡 Hint

Common Mistakes

Importing or returning HTMLResponse or PlainTextResponse instead of JSONResponse.

Returning RedirectResponse which is for redirects.

JSONResponse is used to send JSON formatted responses in FastAPI.

5fill in blank

hard

Fill all three blanks to create a reliable endpoint with error handling.

FastAPI

from fastapi import FastAPI, HTTPException
from fastapi.responses import [1]

app = FastAPI()

items = {1: 'apple', 2: 'banana'}

@app.get('/items/{item_id}')
async def read_item(item_id: int):
    if item_id not in items:
        raise [2](status_code=404, detail='Item not found')
    return [3](content={'item': items[item_id]})

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

AJSONResponse

BHTTPException

CResponse

DRequest

Attempts:

3 left

💡 Hint

Common Mistakes

Using Request instead of HTTPException for errors.

Returning HTTPException instead of a response.

Not importing JSONResponse.

We import JSONResponse to send JSON data, raise HTTPException for errors, and use JSONResponse to return data.