how does fastapi use httpexception in response?

Yes it is not a valid Pydantic type however since you can create your own models, it is easy to create a Model for it.

from fastapi import FastAPI
from fastapi.exceptions import HTTPException
from pydantic import BaseModel

class Dummy(BaseModel):
    name: str

class HTTPError(BaseModel):
    detail: str

    class Config:
        schema_extra = {
            "example": {"detail": "HTTPException raised."},

app = FastAPI()

        200: {"model": Dummy},
        409: {
            "model": HTTPError,
            "description": "This endpoint always raises an error",
def raises_error():
    raise HTTPException(409, detail="Error raised")

I believe this is what you are expecting

enter image description here

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