Streaming responses in FastAPI - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to import the correct class for streaming responses in FastAPI.

FastAPI

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

app = FastAPI()

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

AHTMLResponse

BJSONResponse

CRedirectResponse

DStreamingResponse

Attempts:

3 left

💡 Hint

Common Mistakes

Using JSONResponse or HTMLResponse which are for full responses, not streaming.

Forgetting to import StreamingResponse.

The StreamingResponse class is used in FastAPI to send streaming data as a response.

2fill in blank

medium

Complete the code to define a generator function that yields streaming data.

FastAPI

def event_stream():
    for i in range(3):
        yield f"data: Message [1]\n\n"

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

Ai

Brange

Cevent

Dmessage

Attempts:

3 left

💡 Hint

Common Mistakes

Using a variable not defined in the loop.

Forgetting to include the loop variable in the string.

The variable i is used in the loop and should be included in the yielded string.

3fill in blank

hard

Fix the error in the FastAPI endpoint to return a streaming response.

FastAPI

from fastapi import FastAPI
from fastapi.responses import StreamingResponse

app = FastAPI()

def generate():
    yield "Hello\n"

@app.get("/stream")
async def stream():
    return [1](generate(), media_type="text/plain")

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

AResponse

BStreamingResponse

CJSONResponse

DHTMLResponse

Attempts:

3 left

💡 Hint

Common Mistakes

Returning JSONResponse or Response which do not stream data.

Forgetting to wrap the generator with StreamingResponse.

The endpoint must return a StreamingResponse to stream data properly.

4fill in blank

hard

Fill both blanks to create a streaming response that streams numbers as bytes.

FastAPI

def number_stream():
    for num in range(1, 4):
        yield str(num).[1]()

@app.get("/numbers")
async def numbers():
    return [2](number_stream(), media_type="application/octet-stream")

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

Aencode

Bdecode

CStreamingResponse

Dformat

Attempts:

3 left

💡 Hint

Common Mistakes

Using decode instead of encode.

Forgetting to convert strings to bytes before streaming.

The numbers must be converted to bytes by calling encode(). The streaming response class is StreamingResponse.

5fill in blank

hard

Fill all three blanks to create a streaming response with a custom header and chunk size.

FastAPI

from fastapi.responses import StreamingResponse

async def custom_stream():
    yield b"chunk1"
    yield b"chunk2"

@app.get("/custom")
async def custom():
    headers = {"X-Custom-Header": "Value"}
    return StreamingResponse(custom_stream(), media_type=[1], headers=[2], chunk_size=[3])

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

A"application/octet-stream"

Bheaders

C1024

D"text/plain"

Attempts:

3 left

💡 Hint

Common Mistakes

Using text/plain for binary data.

Passing headers as a string instead of a dictionary.

Omitting chunk_size or using an invalid value.

The media type for binary data is application/octet-stream. The headers dictionary must be passed as is. The chunk size is set to 1024 bytes for streaming.