@Override
    public void sendResponse(Send payloadToSend, NetworkRequest originalRequest, ServerNetworkResponseMetrics metrics) {
      lastResponse = payloadToSend;
      lastOriginalRequest = originalRequest;
    }
The {@link Send} provided in the last call to {@link #sendResponse(Send, NetworkRequest, ServerNetworkResponseMetrics).
ambry-server/src/test/java/com/github/ambry/server/AmbryServerRequestsTest.java