async fn next_chunk(
stream: &mut ObjectDataStream,
sample: &mut Sample,
first_poll: bool,
trace: &mut RequestTrace<'_>,
token: &CancellationToken,
) -> Result<Option<usize>>async fn next_chunk(
stream: &mut ObjectDataStream,
sample: &mut Sample,
first_poll: bool,
trace: &mut RequestTrace<'_>,
token: &CancellationToken,
) -> Result<Option<usize>>