How to retrieve body only?

[yuyang-ok]

I am new to curl. MY code basic like this.

let mut dst = Vec::new();
    let mut easy = Easy::new();
    easy.url("https://www.rust-lang.org/")
        .map_err(|e| ErrorCode::LoadRest(e.to_string()))?;

    let mut transfer = easy.transfer();
    transfer
        .write_function(|data| {
            dst.extend_from_slice(data);
            Ok(data.len())
        })
        .map_err(|e| ErrorCode::LoadRest(e.to_string()))?;

    transfer
        .perform()
        .map_err(|e| ErrorCode::LoadRest(e.to_string()))?;
    drop(transfer);

    let value = String::from_utf8(dst.clone()).unwrap();
    eprintln!("xxxx:{:?}", value);

How can I only retrieve the http body.

[yuyang-ok]

Is curl's API capable of only retrieve body?