private void checkCommonGetHeadHeaders(MockRestResponseChannel restResponseChannel) {
    assertTrue("No Date header", restResponseChannel.getHeader(RestUtils.Headers.DATE) != null);
    assertTrue("No Last-Modified header", restResponseChannel.getHeader("Last-Modified") != null);
  }
Checks headers that are common to HEAD and GET.
@param restResponseChannel the {@link RestResponseChannel} to check headers on.
ambry-frontend/src/test/java/com/github/ambry/frontend/FrontendRestRequestServiceTest.java