After converting reqwest::Response to http::Response the size hint is lost

[blind-oracle]

It seems that body size information is gone, e.g.

#[cfg(test)]
mod test {
    use http_body::Body as _;
    use reqwest::ResponseBuilderExt;

    #[test]
    fn test() {
        let url = url::Url::parse("http://foo.bar").unwrap();
        let body = reqwest::Body::from("foo");
        let resp = http::response::Builder::new()
            .status(200)
            .url(url)
            .body(body)
            .unwrap();

        assert_eq!(resp.body().size_hint().exact(), Some(3));
        let resp = reqwest::Response::from(resp);
        assert_eq!(resp.content_length(), Some(3));
        let resp: http::Response<_> = resp.into();
        assert_eq!(resp.body().size_hint().exact(), Some(3));
    }
}

The first two asserts succeed, the last one fails. It would be nice if we can make this work.

[seanmonstar]

Interesting! Anyone interested in digging it is welcome, it shouldn't be too complicated.