@Override
public String renderPayload(String packageName, String methodName, byte[] payload,
boolean isRequestPayload) {
try {
EmptyProto proto = InternalProtos.EmptyProto.newBuilder().mergeFrom(payload).build();
return TextFormat.printToString(proto.getUnknownFields());
} catch (InvalidProtocolBufferException e) {
return "???";
}
}