@Override
    public ResponseStatus getStatus() {
      return responseStatus;
    }
Creates a new instance of NoOpRestResponseChannel.
@param restRequest the {@link RestRequest} for which a response will be sent over this channel.
@param perfNioServerMetrics the {@link PerfNioServerMetrics} instance to use to record metrics.
@param callback the {@link Callback} that will be invoked on {@link #onResponseComplete(Exception)} or
{@link #close()}.
ambry-tools/src/main/java/com/github/ambry/tools/perf/rest/PerfNioServer.java