code: static void handle(ChannelHandlerContext ctx, Http2Connection connection,
                                Http2FrameListener listener, FullHttpMessage message) throws Http2Exception {
          try {
              int streamId = getStreamId(connection, message.headers());
              Http2Stream stream = connection.stream(streamId);
              if (stream == null) {
                  stream = connection.remote().createStream(streamId, false);
              }
              message.headers().set(HttpConversionUtil.ExtensionHeaderNames.SCHEME.text(), HttpScheme.HTTP.name());
              Http2Headers messageHeaders = HttpConversionUtil.toHttp2Headers(message, true);
              boolean hasContent = message.content().isReadable();
              boolean hasTrailers = !message.trailingHeaders().isEmpty();
              listener.onHeadersRead(
                      ctx, streamId, messageHeaders, 0, !(hasContent || hasTrailers));
              if (hasContent) {
                  listener.onDataRead(ctx, streamId, message.content(), 0, !hasTrailers);
              }
              if (hasTrailers) {
                  Http2Headers headers = HttpConversionUtil.toHttp2Headers(message.trailingHeaders(), true);
                  listener.onHeadersRead(ctx, streamId, headers, 0, true);
              }
              stream.closeRemoteSide();
          } finally {
              message.release();
          }
      }
docs: control, but there is not yet an API for signaling that.