let res: Vec<Question> = store.questions.values().cloned().collect();
    Ok(warp::reply::json(&res))
}

async fn return_error(r: Rejection) -> Result<impl Reply, Rejection> {
    if let Some(error) = r.find::<CorsForbidden>() {
        Ok(warp::reply::with_status(
            error.to_string(),
            StatusCode::FORBIDDEN,
        ))
    } else if let Some(InvalidId) = r.find() {
        Ok(warp::reply::with_status(
            "No valid ID presented".to_string(),
            StatusCode::UNPROCESSABLE_ENTITY,
        ))
    } else {
        Ok(warp::reply::with_status(
            "Route not found".to_string(),
            StatusCode::NOT_FOUND,
        ))
    }
}
...