protected void verifyPostRequestCostHeaders(HttpResponse response, long contentSize) {
    double cuCost = contentSize / SimpleAmbryCostModelPolicy.CU_COST_UNIT;
    cuCost = Math.max(cuCost, 1);
    double storageCost = contentSize / (double) QuotaUtils.BYTES_IN_GB;
    verifyCommonRequestCostHeaders(response, cuCost, storageCost, false);
  }
Verify the request cost headers were attached to the post response properly.
@param response the {@link HttpResponse} to be verified.
@param contentSize size of the content posted.
ambry-frontend/src/integration-test/java/com/github/ambry/frontend/FrontendIntegrationTestBase.java