void verifyUndeleteBlobResponse(NettyClient.ResponseParts responseParts) {
    HttpResponse response = getHttpResponse(responseParts);
    assertEquals("Unexpected response status", HttpResponseStatus.OK, response.status());
    assertTrue("No Date header", response.headers().getTimeMillis(HttpHeaderNames.DATE, -1) != -1);
    assertEquals("Content-Length is not 0", 0, HttpUtil.getContentLength(response));
    assertNoContent(responseParts.queue, 1);
    assertTrue("Channel should be active", HttpUtil.isKeepAlive(response));
    verifyTrackingHeaders(response);
  }
Verifies right response headers for undelete blob.
@param responseParts {@link com.github.ambry.rest.NettyClient.ResponseParts} object.
ambry-frontend/src/integration-test/java/com/github/ambry/frontend/FrontendIntegrationTestBase.java