@Override
    public long getStartTimeInMs() {
      return 0;
    }
Constructs a {@link MockRequest} from {@code request}.
@param request the {@link RequestOrResponse} to construct the {@link MockRequest} for.
@return an instance of {@link MockRequest} that represents {@code request}.
@throws IOException
ambry-server/src/test/java/com/github/ambry/server/AmbryServerRequestsTest.java