This asks our server for the same small file twice — once normally, once forcing a fresh copy — and compares the timestamps. If they differ, your browser answered the first one from its own cache.

A working cache is a good thing — it’s why pages load quickly. This test isn’t looking for a problem to fix; it shows you the mechanism that makes a page go stale, so the instructions on this site make sense.

If the test says your browser is caching and a particular page is still showing old content, the cache is a reasonable suspect. Find your browser and do a hard refresh first.

A working cache is a good thing — it’s why pages load quickly. This test isn’t looking for a problem to fix; it shows you the mechanism that makes a page go stale, so the instructions on this site make sense.

If the test says your browser is caching and a particular page is still showing old content, the cache is a reasonable suspect. Find your browser and do a hard refresh first.

A working cache is a good thing — it’s why pages load quickly. This test isn’t looking for a problem to fix; it shows you the mechanism that makes a page go stale, so the instructions on this site make sense.

If the test says your browser is caching and a particular page is still showing old content, the cache is a reasonable suspect. Find your browser and do a hard refresh first.

A working cache is a good thing — it’s why pages load quickly. This test isn’t looking for a problem to fix; it shows you the mechanism that makes a page go stale, so the instructions on this site make sense.

If the test says your browser is caching and a particular page is still showing old content, the cache is a reasonable suspect. Find your browser and do a hard refresh first.