Streaming responses in FastAPI - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is a streaming response in FastAPI?

A streaming response sends data to the client piece by piece as it is generated, instead of sending all data at once. This helps with large data or long processes.

beginner

Which FastAPI class helps to create streaming responses?

The <code>StreamingResponse</code> class is used to send streaming data back to the client in FastAPI.

intermediate

How do you create a generator function for streaming in FastAPI?

You define a function using yield to send parts of data one by one. FastAPI uses this generator to stream data.

intermediate

Why use streaming responses instead of normal responses?

Streaming responses reduce memory use and improve speed by sending data as it is ready. This is useful for big files or slow data sources.

beginner

What content type should you set for streaming a text file in FastAPI?

You should set media_type='text/plain' in StreamingResponse to tell the browser it is plain text.

Which FastAPI class is used to send streaming responses?

A FileResponse

B StreamingResponse

C JSONResponse

D HTMLResponse

StreamingResponse is designed to send data in chunks as it becomes available.

What Python feature is commonly used to create streaming data for FastAPI?

A Synchronous functions

B List comprehensions

C Generator functions with yield

D Class inheritance

Generator functions use yield to produce data piece by piece, perfect for streaming.

Why might you choose streaming responses over normal responses?

A To avoid using generators

B To make the server slower

C To send all data at once

D To send data faster and save memory

Streaming sends data as ready, reducing memory and improving speed.

Which media type is appropriate for streaming plain text files?

A text/plain

B application/json

C image/png

D video/mp4

text/plain tells the client the data is plain text.

What does the yield keyword do in a generator function?

A Sends one piece of data and pauses the function

B Ends the function immediately

C Returns a list

D Creates a new thread

Yield sends data and pauses, allowing streaming piece by piece.

Explain how to create a streaming response in FastAPI using a generator function.

Think about how to send data piece by piece instead of all at once.

Describe the benefits of using streaming responses in web applications.

Consider what happens when sending big data or slow data.