Can't handle ParseError and other param errors

[Mahoo12138]

This is a project created with salvo-cli:

use salvo::http::ParseError;
use thiserror::Error;

#[derive(Error, Debug)]
pub enum AppError {
    #[error("error:`{0}`")]
    AnyHow(#[from] anyhow::Error),
    #[error("http::ParseError:`{0}`")]
    ParseError(#[from] ParseError),
}

impl ErrorResponseBuilder {
    pub fn into_response(self, res: &mut Response) {
        let status_code = match self.source_error {
            AppError::AnyHow(_) => StatusCode::INTERNAL_SERVER_ERROR,
            AppError::ParseError(_) => StatusCode::BAD_REQUEST,
        };
        res.stuff(status_code, Json(self));
    }
}

pub type AppResult<T> = Result<T, AppError>;

#[async_trait]
impl Writer for AppError {
    async fn write(mut self, _req: &mut Request, _depot: &mut Depot, res: &mut Response) {
        ErrorResponseBuilder::with_err(self).into_response(res)
    }
}

#[handler]
pub async fn get_words(
    dict_id: QueryParam<String>,
) -> AppWriter<Vec<WordResponse>> {...}

[obmutescences]

same question.

#[derive(Debug, Deserialize, Serialize)]
struct User {
    id: i64,
}

#[handler]
async fn json_req(user: JsonBody<User>, res: &mut Response) {
    println!("req json id: {:?}", user.id);
    let user2 = User { id: user.id };
    res.render(Json(user2))
}

when parse json body, how to cather error then return json response like:

{
"code": -2,
"msg": "parse details error"
}

and apply to anther post, get request