* 📝 Add External Link: FastAPI do Zero. PR [#12533](https://github.com/fastapi/fastapi/pull/12533) by [@rennerocha](https://github.com/rennerocha).
* 📝 Fix minor typos. PR [#12516](https://github.com/fastapi/fastapi/pull/12516) by [@kkirsche](https://github.com/kkirsche).

import warnings

import pytest
from fastapi import APIRouter, Depends, FastAPI, Response
from fastapi.responses import JSONResponse
from fastapi.testclient import TestClient


class ResponseLevel0(JSONResponse):
    media_type = "application/x-level-0"


class ResponseLevel1(JSONResponse):
    media_type = "application/x-level-1"


class ResponseLevel2(JSONResponse):
    media_type = "application/x-level-2"