p: Annotated[Optional[str], Header(alias="p_alias")] = None,
):
    return {"p": p}


class HeaderModelOptionalAlias(BaseModel):
    p: Optional[str] = Field(None, alias="p_alias")


@app.get("/model-optional-alias")
async def read_model_optional_alias(p: Annotated[HeaderModelOptionalAlias, Header()]):
    return {"p": p.p}


@pytest.mark.parametrize(
    "path",