Make IE cache the resources but always revalidate
I’ve eventually figured it out. Here is an explanation and a tested solution. The following site confirms my observation: http://blog.httpwatch.com/2008/10/15/two-important-differences-between-firefox-and-ie-caching/ It says that IE does not locally store pages with the ‘no-cache’ directive and hence always sends an unconditional request. There’s also a MS support article – https://support.microsoft.com/help/234067/ – which confirms this: “Internet Explorer supports … Read more