How to modify the response body

[yuenxillar]

Summary

I tried to modify the body of the response, but encountered an error message. How can I determine the specific type of the body and convert it to obtain the desired struct

axum version

0.7.5

[Threated]

In your handler you need to take a mut response: Response<B>.

[yuenxillar]

OK,I obtained the desired response content through the following methods

[yuenxillar]

May I ask how I will add the body to the response

[Threated]

In your case I think *body = a; might do it as you have a mutable reference to the body.
And just that you know it might be easier to define your function like this instead of dealing with the down casting business.

use http_body_util::BodyExt;
use axum::{
    body::{Body, Bytes},
    extract::State,
    response::Response,
};

async fn my_middle(State(_state): State<()>, res: Response) -> Response {
    let (parts, body) = res.into_parts();
    let collected_body = body.collect().await.unwrap();
    let mut api_res: ApiRes = serde_json::from_slice(&collected_body).unwrap();
    // Do stuff with api_res
    let new = Body::from(serde_json::to_vec(&api_res).unwrap());
    Response::from_parts(parts, new)
}

[yuenxillar]

ok， After your suggestion, it has been successfully implemented. Thank you