gistfile1.txt

/code fn write_with_body(mut res: HttpResponse<Fresh>, mut body: Box<Reader + Send>) -> IoResult<()> {
    let content_type = res.headers().get::<headers::ContentType>()
                           .map(|cx| cx.clone())
                           .unwrap_or_else(|| headers::ContentType("text/plain".parse().unwrap()));
    res.headers_mut().set(content_type);

    let mut res = try!(res.start());

    // FIXME: Manually inlined old_io::util::copy
    // because Box<Reader + Send> does not impl Reader.
    //
    // Tracking issue: rust-lang/rust#18542
    let mut buf = &mut [0; 1024 * 64];
    loop {
        let len = match body.read(buf) {
            Ok(len) => len,
            Err(ref e) if e.kind == old_io::EndOfFile => break,
            Err(e) => { return Err(e) },
        };

        try!(res.write_all(&buf[..len]))
    }

    res.end()
}