] = None,
):
    return {"p": p}


class HeaderModelOptionalAliasAndValidationAlias(BaseModel):
    p: str | None = Field(None, alias="p_alias", validation_alias="p_val_alias")


@app.get("/model-optional-alias-and-validation-alias")
def read_model_optional_alias_and_validation_alias(
    p: Annotated[HeaderModelOptionalAliasAndValidationAlias, Header()],
):
    return {"p": p.p}