Status code control in FastAPI - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is the purpose of status code control in FastAPI?

Status code control in FastAPI lets you specify the HTTP response code sent back to the client, showing if the request was successful, failed, or something else.

beginner

How do you set a custom status code for a response in a FastAPI path operation?

You can set a custom status code by using the status_code parameter in the path operation decorator, like @app.post('/items/', status_code=201).

beginner

What is the default status code for a successful GET request in FastAPI?

The default status code for a successful GET request in FastAPI is 200 OK.

intermediate

How can you return a different status code dynamically inside a FastAPI path function?

You can return a Response or JSONResponse object with a custom status_code set, or raise an HTTPException with the desired status code.

beginner

What status code should you use in FastAPI when a resource is successfully created?

Use status code 201 Created to indicate a resource was successfully created.

Which status code indicates a successful POST request that created a resource?

A 200

B 201

C 404

D 500

201 means the resource was created successfully.

How do you specify a status code of 204 (No Content) in a FastAPI route?

A Use <code>status_code=204</code> in the decorator

B Return <code>None</code> from the function

C Raise <code>HTTPException(status_code=204)</code>

D Set <code>response.status_code = 204</code> inside the function

You specify it in the decorator with status_code=204.

What happens if you don't specify a status code in a FastAPI GET route?

A FastAPI returns 404 by default

B FastAPI returns 500 by default

C FastAPI returns 200 by default

D FastAPI returns 201 by default

The default status code for successful GET is 200.

Which FastAPI class can you use to raise an error with a specific status code?

A Response

B Request

C JSONResponse

D HTTPException

HTTPException lets you raise errors with custom status codes.

To return a 404 Not Found error in FastAPI, you should:

A Raise <code>HTTPException(status_code=404)</code>

B Return <code>None</code>

C Set <code>status_code=404</code> in the decorator

D Return a string '404'

Raising HTTPException with 404 tells FastAPI to send a 404 response.

Explain how to control HTTP status codes in FastAPI path operations.

Think about decorator options and exceptions.

Describe when and why you would use status code 201 in FastAPI.

Consider POST requests creating new items.