  void respondServiceStatus(size_t index,
                            grpc::health::v1::HealthCheckResponse::ServingStatus status) {
    respondResponseSpec(index,
                        ResponseSpec{{{":status", "200"}, {"content-type", "application/grpc"}},
                                     {ResponseSpec::validChunk(status)},
                                     {{"grpc-status", "0"}}});
  }
  void respondServiceStatus(size_t index,
                            grpc::health::v1::HealthCheckResponse::ServingStatus status) {
    respondResponseSpec(index,
                        ResponseSpec{{{":status", "200"}, {"content-type", "application/grpc"}},
                                     {ResponseSpec::validChunk(status)},
                                     {{"grpc-status", "0"}}});
  }