Broadcasting to multiple clients 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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AFastAPI

BRequest

CDepends

DWebSocket

Attempts:

3 left

💡 Hint

Common Mistakes

Importing WebSocket instead of FastAPI

Using lowercase fastapi instead of FastAPI

The FastAPI class is imported to create the app instance.

2fill in blank

medium

Complete the code to accept a WebSocket connection in FastAPI.

FastAPI

@app.websocket("/ws")
async def websocket_endpoint(websocket: [1]):
    await websocket.accept()

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ARequest

BDepends

CWebSocket

DResponse

Attempts:

3 left

💡 Hint

Common Mistakes

Using Request instead of WebSocket

Forgetting to accept the connection

The WebSocket parameter type is used to handle WebSocket connections.

3fill in blank

hard

Fix the error in the code to send a message to the WebSocket client.

FastAPI

await websocket.[1](text_data="Hello Client")

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Asend_message

Bsend_json

Csend_text

Dsend

Attempts:

3 left

💡 Hint

Common Mistakes

Using send_text which does not exist

Using send_json when sending plain text

The correct method to send text data is send with the text_data argument.

4fill in blank

hard

Fill both blanks to broadcast a message to all connected clients stored in a list.

FastAPI

clients = []

async def broadcast(message):
    for client in clients:
        await client.[1](text_data=[2])

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Asend

Breceive

Csend_text

Dmessage

Attempts:

3 left

💡 Hint

Common Mistakes

Using receive instead of send

Using send_text which is not a valid method

To send a message to each client, use send with the message variable.

5fill in blank

hard

Fill all three blanks to add a new WebSocket client to the list and broadcast a welcome message.

FastAPI

clients = []

@app.websocket("/ws")
async def websocket_endpoint(websocket: WebSocket):
    await websocket.accept()
    clients.[1](websocket)
    await broadcast([2])

async def broadcast(message):
    for client in clients:
        await client.send(text_data=[3])

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Aappend

B"Welcome new client!"

Cmessage

Dremove

Attempts:

3 left

💡 Hint

Common Mistakes

Using remove instead of append

Sending the wrong variable in broadcast

Use append to add the client, send a welcome string, and broadcast the message variable.