message: Make is_no_responders public
diff: @@ -72,8 +72,8 @@ impl Message {
  }
  }
  - // Helper for detecting no responders response.
  - pub(crate) fn is_no_responders(&self) -> bool {
  + /// Determine if the message is a no responders response from the server.
  + pub fn is_no_responders(&self) -> bool {
  use crate::headers::STATUS_HEADER;
  if !self.data.is_empty() {
  return false;
  