Why WebSockets enable real-time communication in FastAPI - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to import the WebSocket class from FastAPI.

FastAPI

from fastapi import [1]

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

AResponse

BWebSocket

CRequest

DDepends

Attempts:

3 left

💡 Hint

Common Mistakes

Importing Request or Response instead of WebSocket.

Forgetting to import WebSocket causes errors when using it.

The WebSocket class is imported from FastAPI to handle WebSocket connections.

2fill in blank

medium

Complete the code to accept a WebSocket connection inside an endpoint.

FastAPI

async def websocket_endpoint(websocket: WebSocket):
    await websocket.[1]()

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

Aaccept

Bclose

Csend_text

Dreceive_text

Attempts:

3 left

💡 Hint

Common Mistakes

Calling send_text before accepting the connection.

Not calling accept causes the connection to be rejected.

The accept() method is called to accept the WebSocket connection from the client.

3fill in blank

hard

Fix the error in the code to receive a message from the client.

FastAPI

data = await websocket.[1]()

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

Asend_text

Baccept

Creceive_text

Dclose

Attempts:

3 left

💡 Hint

Common Mistakes

Using send_text instead of receive_text.

Trying to accept or close instead of receiving data.

The receive_text() method receives a text message from the client over the WebSocket.

4fill in blank

hard

Fill both blanks to send a message back to the client with the received data.

FastAPI

await websocket.[1](text='Message received: ' + [2])

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

Asend_text

Bdata

Creceive_text

Daccept

Attempts:

3 left

💡 Hint

Common Mistakes

Using receive_text instead of send_text to send data.

Using accept or close instead of send_text.

Using receive_text or accept instead of the data variable.

Use send_text to send a message, and data is the variable holding the received message.

5fill in blank

hard

Fill all three blanks to create a simple FastAPI WebSocket app that echoes messages.

FastAPI

from fastapi import FastAPI, [1]

app = FastAPI()

@app.websocket('/ws')
async def websocket_endpoint(websocket: [2]):
    await websocket.[3]()
    while True:
        data = await websocket.receive_text()
        await websocket.send_text(f'Echo: {data}')

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

AWebSocket

BRequest

Caccept

DResponse

Attempts:

3 left

💡 Hint

Common Mistakes

Using Request or Response instead of WebSocket.

Forgetting to call accept() before communication.

Import WebSocket, use it as the parameter type, and call accept() to start the connection.