docs: public static ProtocolNegotiator serverTls(final SslContext sslContext) {
      Preconditions.checkNotNull(sslContext, "sslContext");
      return new ProtocolNegotiator() {
        @Override
        public ChannelHandler newHandler(GrpcHttp2ConnectionHandler handler) {
          return new ServerTlsHandler(sslContext, handler);
        }
  
        @Override
        public void close() {}
  
  
        @Override
        public AsciiString scheme() {
          return Utils.HTTPS;
        }
      };
    }