How to print the request body ?

[paulzhang5511]

        .attach(AdHoc::on_request("PUT Rewriter", |req, _| {
            Box::pin(async move {
                println!("    => Incoming request: {}", req);
            })
        }))
        .attach(AdHoc::on_response("Response Rewriter", |req, res| {
            Box::pin(async move {
                if req.uri().path() == "/" {
                    println!("    => Rewriting response body.");
                    let s = res.body_mut().to_string().await.unwrap();
                    println!("body --> {}", s);
                    res.set_sized_body(None, Cursor::new(s));
                }
            })
        }))

The above code can only print the response body, I don't know how to print the request body.

[jebrosen]

The second parameter to an on_request fairing (currently _ in your posted example) is an &mut Data, which can be used to peek at the beginning of the request data.

If you do need to read the entire data, you should use a data guard on the appropriate route instead - but see also #775 regarding some of the limitations. In particular, it's not easy out-of-the-box to both print the body data and do something else with it, such as parsing JSON input.