Function read_response 

fn read_response(
    open: &OpenRequest,
    status: u16,
    target: &UrlTarget,
    sink: &mut dyn FnMut(&[u8]) -> bool,
    progress: &'_ mut dyn FnMut(u64, Option<u64>),
    cancel: &AtomicBool,
) -> Result<(), HttpError>