s3s: http: full_body

        let content_length = req

            .headers()

            .get(hyper::header::CONTENT_LENGTH)

            .and_then(|val| atoi::atoi::<u64>(val.as_bytes()))

            .ok_or(S3ErrorCode::MissingContentLength)?;

            .and_then(|val| atoi::atoi::<u64>(val.as_bytes()));

        if let Some(content_length) = content_length {

            check_len(content_length, limit)?;

        }

        let bytes = concat(body, limit).await?;

        if bytes.is_empty() {

            return Ok(Self(bytes));

        }

        let content_length = content_length.ok_or(S3ErrorCode::MissingContentLength)?;

        if bytes.len() as u64 != content_length {

            return Err(s3_error!(IncompleteBody));

        }