Copying a response body.

[amokfa]

Summary

I need to write a middleware that's supposed to read the body in case the request fails with an error. This is what I have right now:

pub async fn my_middleware(mut req: Request, next: Next) -> Response {
    let mut resp = next.run(req).await;
    let error = if resp.status().is_success() {
        None
    } else {
        // TODO: clone the response body
        Some(error)
    };
    process_error(error);
    resp
}

I want to know what's the best way of implementing the cloning part. I know that the body can be buffered, which is why it doesn't have a clone method.

One way I can think of is to buffer the whole body, clone it, and then create a new Response with the status code, headers, and the buffered body. I wonder if that's enough and whether I'm forgetting something.

axum version

0.8.1

[yanns]

Maybe you could use this method to get the Byte out of the body: https://docs.rs/axum/latest/axum/body/fn.to_bytes.html
Then you could create a new Response from it.