code: protected final void removeMessage(Http2Stream stream, boolean release) {
          FullHttpMessage msg = stream.removeProperty(messageKey);
          if (release && msg != null) {
              msg.release();
          }
      }
docs: The stream is out of scope for the HTTP message flow and will no longer be tracked
  @param stream The stream to remove associated state with
  @param release {@code true} to call release on the value if it is present. {@code false} to not call release.