tiangolo.fastapi/docs/en/docs/reference/response.md

Response class

You can declare a parameter in a path operation function or dependency to be of type Response and then you can set data for the response like headers or cookies.

You can also use it directly to create an instance of it and return it from your path operations.

Read more about it in the FastAPI docs about returning a custom Response

You can import it directly from fastapi:

from fastapi import Response

::: fastapi.Response