Actix extractors make it simple to get the target data types to directly handle in handlers, like

#[post("/records")]
async fn post_records(
    service_data: Data<X>,
    changes: Json<Changes>,
) -> (String, StatusCode);

But when client posts wrong Json format, by default, all I got was an unable to parse error. I want to get the JSON for debugging.

Seeing in its document, there is a JsonConfig I can play a little. But following code actually could not compile since the handler is not async.

                .app_data(JsonConfig::default().error_handler(|err, req| {
                    let bytes = Bytes::extract(req).await.unwrap();
                    let str = String::from_utf8(bytes.to_vec()).unwrap();
                    log::warn!("{:?}", str);
                    err.into()
                }))

So what is the correct way? If I do not want to just get the raw body in handler and deserialize by myself?

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